I think this is great however my gripe with this is the points that effects your choices like in the Great Crusade. This GC,WMC and the Horus Hersey really confused me with the points. Perhaps you could explain it easier or simplify it? Also I think you should add more options in there like the Legion continues to fight on in the Hersey even if the Primarch is killed in the first battle
This what I got which is not nice lol

Legion: Glaucous Templars
Number: II
Homeworld: Mousillon
Primarch: Janusch Feuer
Nickname: The Silver Ritter
Side: Loyalist
Janusch Feuer, Primarch of the Silver Cavaliers later renamed the Glaucous Templars was born on Mousillon where he was found in a crater by Holy Mousillon Knights whom would later adopt him as one of his own believing him to be a Star Child. As a child, he quickly grew and became skilled in warfare, becoming a Crusading Knight called a Templar and fought in a dozen campaigns secure the land with his adoptive parents. In the 27th Crusade, He took command of his parent's knightly Order during battle when his adoptive parents were slain in battle by hordes of ebony infidels where he led them in a near perfect victory, crushing the enemy in battle and seized the ebony city itself and soon controlled it. With his new powers as a Lord Templar, He began his own crusade to conquer all of Mousillon in the names of the knights who had adopted him. Within a ten year war, he conquered Mousillon and began planning with his Lord Commanders to conquer the solar system when a mysterious golden figure. This golden figure was quickly labeled the Star God of Mousillon with all bowing before him. When he reached the Ebony Palace, now purified with a silver-bluish like color, when Janusch Feuer saw the Star God, without hesitation he bowed before the Star God. The Emperor knew Janusch Feuer was his son and asked him to join him in the Great Crusade at his side, Janusch Feuer hastily accepted having the same idea. Before all the lords of Mousillon, Janusch Feuer swore fealty to the Emperor and proclaimed to his father, all Lords and his adoptive sister present the Grand Crusade shall begin sooner than expected vowed he would stop until the Galaxy was conquered.
Days later he and his sister met the II Legion, the Silver Cavaliers whom doctrine was shock and awe, to crush the enemy at the greatest moment with two-handed weaponry. He decided rename his Legion Glaucous Templars as the beginning of a mark on their history. He had named the Glaucous Templars due to the Ebony City being purified of Chaos Taint and changing colors from black to Glaucous Silver. He would continue his hunt against Chaos, even in secretly if possible. After taking control of the Glaucous Templars, He organized the Legion, it's traditions and ideologies to reflect Mousillon and her Templar Knights. Many Templar Knights from Mousillon joined the II legion with his sister, Marianne Feuer joined the II legion as well as a Pseudo Astartes with her taking her place alongside her brother as his advisor and even a Lord Templar Commander when needed.
During the Great Crusade Janusch Feuer became close with his brother Rogal Dorne who often fought in the same campaigns with the Glaucous Templars often going on the offensive while the Imperial First secured Defense lines and fortified locations of importance, not to mention the importance of the Crusade and their father. However, it was during this time Rogal Dorne introduced him to Huros who immediately gave Janusch Feuer red flags, He wasn't sure why but something about Horus seemed off or something was wrong with him This led to him being isolated from his brothers although the majority of his brothers often didn't take liking to him in the first place for some reason. Following this, following this on the direct orders of the Emperor, Janusch Feuer returned to Terra where the Emperor told his son in complete secrecy
that he, the majority of his people of Mousillon, his sister and his Legion were psychic Pariahs along with Their true objective in the Great Crusade was to ride the galaxy of Chaos and that they were the only to do it since they could not fall to the temptations of Chaos. Due to this, the Emperor orderd his son to work in complete secrecy and to never tell of Chaos to anyone, even his brothers. Janusch Feuer accepted this burden and with the orders of the Emperor himself, the Glaucous Templars began their crusade on Chaos in secret often working in complete secrecy or misleading others when allied during a campaign or battle which caused even bigger rift between him and his brothers, only strengthing his bond with Marianne even more. During this time, despite Marianne being a Pseudo Astartes, she often fought alongside her brother as one, able to read each other movements and often thoughts where they became a nearly unstoppable force when working together but this was not common. Marianne had formed her own Valkyrie unit, the Sisters of Silence whom she often led in battle when not with her brother.
After the Ullanor Crusade, after fighting by his legions and his father's side and showing the true martial abilities of the Templars, showing such ferocity and determination not since seen impressed the Emperor himself but not enough when the Emperor declared Horus "Warmaster" which. Janusch Feuer was absolutely saddened and livid that he or once or one of his more strategic brothers wasn't chosen, He always knew Horus was the favorite but it never bothered him since the Emperor never openly showed it until now. Upon seeing this, Janusch Feuer openly challenged Horus to an Honour duel which before Horus could answer, The Emperor openly told him as he stood before him. If he was to question the Emperor's wisdom, he would need to battle him instead. Knowing he was beaten before the battle could even be joined, With his sword, Janusch Feuer bowed before the Emperor, taking an Oath to openly follow Horus's Command and out of duty even though in mind, he was embittered by it. Even though the Emperor and Horus accepted this Vow, this oath, this had permanently damaged Janusch Feuer's relationship with the two and would never recover as the Emperor grew more and more distant from his son and with Horus giving him less "Glorious" campaigns for his legions even though the Glaucous Templars had a habit of disobeying orders and following their own Crusade with the Imperial Army behind them in their eternal crusade on Chaos.
During the closing days of the Great Crusade, Janusch Feuer with his legion fought alongside Lorgar with the Word Bears during a military campaign where the Human populace of this fallen, crumbling empire was tainted and followed the Rune powers of Chaos. Despite the technological and military superiority of the Imperium, The war ended eventually with a hard-won victory but only after many years of constantly long and difficult battles, these Humans were dug in everywhere and were fanatical, dying by the millions willingly for their gods who they thought would save them. Not to mention Lorgar would often mysteriously withdraw his Legion from the battlefield often at times to gather and study the Religious structures, tomes and even capturing of their prophets. Lorgar gathered all of this and studied them, becoming fascinated with them which would slowly change him. Janusch Feuer saw this through his talks with him, his stances with him and even looking at his eyes. Janusch Feuer knew he had changed but he knew couldn't directly challenge Lorgar, no instead he would have to do what is right. Following this bloody crusade, His sister Marianne took command of the Glaucous Templars and continued their crusade on Chaos while Janusch Feuer returned to Terra itself to tell the Emperor that Lorgar had most likely fallen to Chaos, finding the Gods he so wanted to worship since he could not worship their father. Upon hearing, The Emperor did not believe Janusch Feuer and entered a fiery debate with his father for hours until Janusch Feuer stormed out of the Imperial Palace which had basically had ended his relationship with his father, this would be the last time Janusch Feuer or the Emperor would see each other again. Despite this falling out though, he would continue his duty to the Imperium and his duty with the Destruction of Chaos.
When the beginning of the end began with Horus rebelling against their father, Janusch Feuer was not surprised at all by this result, knowing something like this would happen but could never state it to their father since he could believe one of his sons could fall, as a result he was blinded and nothing could be done. When Horus took his brother's and their Legions as well, it was time to end this at Ittssvain before it could begin. When the Itssvain Massacre began with the so-called Loyalist Legions turned traitor and began ripping apart the line, The Glaucous Templars were spread out along the Loyalist Line, providing any support while Janusch Feuer in the middle where the fighting was thickest, leading constant assaults on the traitor line to keep them at bay while his sister, Marianne led the defensive forces. Eventually even the primarch was pushed and when it became apparent there was no hope for victory and they needed to withdraw if they were to have any hopes of surviving the battle. Janusch Feuer and the part of his Legion that was with him decided to stay behind on Itssvain to give Corex, Vulken and what remained of the legions enough time to withdraw. By this time most of his Legion was destroyed and while most were determined to die with their Primarch, Janusch Feuer for the last time hugged his sister, Marianne and ordered her to take what was left of their Legion and withdraw with Corex while he stayed behind. Although she hesitated for a moment, she did not dare question his orders and silently accepted his orders. With their withdraw, Janusch Feuer and his sons continued their last stand against the traitors. When it became apparent it was taking longer than expected to eliminate Janusch Feuer and what remained of his legion, Horus ordered both, Perturabo and Angron to kill Janusch Feuer fully knowing Janusch Feuer martial abilities enough to know he was too much for a single opponent to take on directly. Janusch Feuer fought heroically against his two brothers but even he could not stand against two of his brothers forever. When he knew the loyalist had escaped, he lowered his duel great swords and allowed himself to be killed knowing he had completed his duty.
With the death of their primarch, The Glaucous Templars forever knew shame and regret, not being able to die alongside their Primarch and knowing they had failed in the Great Crusade but with Lady Marianne now leader of the Glaucous Templars, she reaffirmed them in their duty, Even though they all, including herself wanted to die for abandoning her broter and letting him die, they all knew they still had there duty to the Emperor and they would complete there duty before dying or die trying. With Lady Marianne's word, the Legion fiery spirit was burned hot once more where they traveled to Terra and joined Rogal Dorne in the defense of the Imperial Palace. While at first he completely turned them awat but after seeing their determination and there will of fire to protect the Emperor and the Imperium, he agreed working with Rogal Dorne on it's defenses. When the final battle occurred finally, Lady Marianne let Rogal Dorne take control of the Legion during the Siege of the Imperial Palace since he would know better where to deploy them although she continues to lead them on the front. Towards the end of the battle when the Emperor and the remaining Primarches decided to teleport, with the Glaucous Templars hallway to being completely destroyed, Lady Marianne and some of her most veteran Astartes volunteered to go with them and with support with Rogal Dorne, the Emperor agreed to Lady Marianne's request in honour of her brother's name. When they teleported aboard Horus flagship, Lady Marianne and the Glaucous Templars teleported in the same location with the Emperor, Determined to keep the Emperor safe at all cost to make sure he could finish what her brother started years ago, Lady Marianne led her brothers throughout the ship, defending the Emperor at all cost with the Glaucous Templars almost completely destroyed to the last man with Lady Marianne herself mortally wounded but not before using her quick speed and thinking to pushing the emperor out of enemy fire, earning her the title "Lady Marianne the Flash" by the Emperor himself. Eventually the Emperor was forced to abandoned them as they drew close to the bridge and the Emperor forbided the wounded survivors of the Glaucous Templars to enter in the aspect they would most likely be destroyed however they were determined to complete there duty, stubborn to the end watching the Emperor battle Horus at the end of time, knowing fully now they could not help. When Rogal Dorne finally found the few mortal wounded survivors of the Glaucous Templars and the Emperor in a weakened state, Rogal Dorne took them to the Imperial palace where the survivors were treated and the Emperor was laid by his son on the Golden Throne, giving him his final instructions as well as telling him Lady Marianne is a living icon of the Imperium as she defended him at all cost to reach Horus, almost dying for him. Following the Emperor entering Stasis and the ending of the Battle of Terra and eventually the Hersey, The Glaucous Templars were almost completely destroyed to the last man as only a few hundred remained but by this point they no longer wore the colors of their legion, instead everyone took up the Emperor's Champion vow set by Rogal Dorne. By the Second Founding and the true end of the Hersey, a portion of the remaining Glaucous Templars had honorably committed suicide in an attempt release them from their hell and to be with their Primarch once more in spirit while nearly halve of the remaining Legion joined the Imperial First and helped formed the Black Templars under the original Emperor's Champion command. The other half led by Lady Marianne the Flash now declared a Saint essentially donned their Legions color's once more and entered exile permanently, beginning the first Penance Crusade into the Eye of Terror in hopes to gain their honor and forgiveness from there primarch and there Emperor but before Lady Marianne said her goodbyes to Rogal Dorne whom now at this point looked at her as a little sister who wanted to protect her but he knew he could keep her here for she is stubborn as her brother ,Janusch Feuer. Before departing, Lady Marianne requested that all records of their Legion be destroyed since in there eyes, they had failed her brother and the Emperor and with the Legion now completely gone now essentially with most now in the Black Templars, committed suicide or have joined her in their final crusade against Chaos, there was no point. After saying there farewells, He watched as Lady Marianne and her Templars board there thunderhawks, as they boarded however, a golden aura began to flicker around their bodies. Rogal Dorne kept good on his word and had the Glaucous Templars completely erased from history. In the 41st millennium, most historians and chapters simply see the Glaucous Templars as a second founding chapter that was destroyed quickly afterward by Chaos remnant forces from the Hersey and Saint Marianne is a mysterious Saint with almost nothing known about her but telling how she boarded Horus flagship and almost died defending the Emperor but is considered myth in the same matter as Ollanius Pius.
Fellow Primarch present (1d20)
-2 if it's Lorgar
Medieval World
A world where the values of knighthood are active part of the society and knight is easily the most respected job on the planet. (+2)
Did he take control of the planet? (1d10)
Yes, and with the general support of the population (+1)
How was his rule over the planet?
Turned the planet into a society were the army and martial prowess is highly respected and desired. Tourney and war battles are the main entertainment in this society. (+1)
Did the Emperor reveal his identity when he arrived? (1d8)
Yes (+1, -1 if perceived to be a superior being)
Did the Primarch wanted to join the Emperor?
Yes (+2)
What was his reaction when he was presented with his Legion? (1d8)
2-4: Renamed his legion and change it to mark a new beginning for it.
3
The Primarch with who your Primarch really getting along. (1d20)
+3 if it's Rogal Dorne
The Primarch that your Primarch hate the most (1d20)
+4 if it's Horus
Fellow Primarch present (1d20)
-2 if it's Lorgar
8
Who is the enemy? (1d10)
1-5: Humans
Difficulty of the Campaign (1d10)
9-10: Bitter Victory, it took an eternity to finish it, too much troops died on it, and massive mistakes were made that prolonged the campaign. Your Legion prefer to not talk about this campaign. (5)
Complications (1d10)
4: One of the Primarchs on this campaign (yours or the other one) act in an excessive way, leaving bitter memeries of this campaign. (-1)
7
Ulanor Crusade (1d6)
For the last time, your Primarch was able to fight alongside the Emperors. The sight of father and son, back-to-back and making their way through waves of Orks, will remain in the imperial history forever. (+5)
12
Ulanor Triomph (1d6)
1: Your Primarch think he should have been named Warmaster, and that the Emperor made a mistake. (-3)
9
warmaster crusade
Who is the enemy? (1d6)
1-5: Humans
Difficulty of the campaign
7-8: Hard-Won Victory, this campaign was long and difficult, ether because of the enemy being stronger than planed or there was some errors made during the war. (4)
Complications (1d8)
7: Due to some events in this campaign, the Imperial Army comes to respect your Primarch and his Legion, while they themselves begin to appreciate the Imperial Army. (+1)
10
Mark of Chaos
6: Your Primarch realize that whatever it was, it is dangerous, and must be kept out of the Imperium (+2)
12
SIDE IN THE HERESY
When the countdown reach 1 or less, your Primarch must now choose which side he will support in the Heresy. Throw 1d20 and add the modifiers accumulated during the previous parts.
Side (1d20)
11-20: Loyalists
ITSSVAN V: DROP SITE MASSACRE
You're on Itssvan V if your countdown stopped on 1 or 0, whatever side your Primarch is on.
5: Your Legion is mostly destroyed, and will not be able to participate until the latest part of the Heresy. Due to the necessity of returning to its Homeworld, your Legion will need to pass through (Terra Countdown: 2, can't fight in Terra without a Victory in a battle)
Survival of the Primarch (Loyalist) (1d8)
1-3: Killed by a traitor Primarch during the battle. (-1 to any battles of the Heresy)
Any other Primarch present to help? (1d8) (Loyalist)
none/6-8: Your legion is alone on this one
Number of Opponents (1d4)
3-4: 2
Opponents (1d8) (Loyalists)
2: Perturabo/Iron Warriors
4: Angron/World Eaters
How the engagement started (1d8)
primarch dead
3-6: Your Primarch faced them in a standard battle
Battle Result (1d20)
6-8: Although your Primarch and his Legion fought the best they could, they still faced defeat. (3)
Survival (1d10) (Victor)
This victory was achieved at a great cost, the death of your Primarch. His Legion must now continue without him.
SIEGE OF TERRA
The Emperor went on the Vengeful Spirit followed by Rogal Dorne, Sanguinius and your Primarch. However, when your Primarch got separated from the others, he found his way to Horus before the Emperor. And when the Emperor finaly arrived, he found the corpses of two sons at the feat of Horus...
What happened to the Primarch? (1d6) (Loyalist)
dead
What did they think of the Codex Astartes? (1d8) (Loyalist)
massively opposed it along Leman Russ and Rogal Dorne.
How Many Successor Chapters from the Second Founding? (1d6) (Loyalist)
If your forces were decimated on Itssvan (Terra Countdown: -2), your Legion is too weak to divide into Chapters. If they were on Itssvan V, roll 1d4 instead of 1d6.
1: 0