Instead of a Mark, i'd consider your own warband as a Mini-codex (like the Crimson Slaughter...)
I can suggest these two sources:
http://1d4chan.org/wiki/Codex_-_Malal_7e:_/tg/_edition
and
http://www.bolterandchainsword.com/topic/280162-chaos-supplement-followers-of-malal-rules/
OTHERWISE i have this shit houseruled by me:
Codex: Followers of Malice (FoM)
FoM treat all alliances as ally of convenience. Chaos Marines and Chaos Daemons are desperate allies.
FoM select units as per the Codex: Chaos Space Marines with the following differences:
-No named character (followers of malice rarely survive long and no famous villain will ever fight for them)
-No chaos Marks can be selected and any unit that already has a mark of chaos in their special rules cannot be selected.
Furthermore all units from C:FoM have "Preferred Enemy: Codex Chaos Marines, Codex Daemons and Codex Renegade and Heretics"
Also they have
-Supreme Anarchy: every unit not selected from a FoM detachment suffer a -1 Ld when within 6" from any FoM unit.
Every Infantry model can purchase this special rule :
-Wanderers: gain Move trough cover USR and Run moves are at +1" -- 2 pts / 5pts for ICs
They can select relics only from the following list:
-Parasite Flail - 35 pts -
Melee, Str user, AP 4, unwieldly, Daemon weapon, Rend, Fleshbane, Lifeleech*
*Lifeleech: when an enemy model is wounded by this weapon, the wielder can roll a D6: on a 5+ he regains a previously lost wound, up to his maximum.
-Fang of the Renegade -45 pts-
Melee, Str +1, Ap 3, Daemon Weapon, Master crafted, Kinslayer*
*Kinslayer: succesfull invulnerable saves taken against wounds inflicted by this weapon must be rerolled. Models with the "Daemon" USR cannot take invuln. saves against wounds inflicted by this weapon
-The Armour of the Halves -25 pts-
Fear, 2+ Armour save, count also as Defensive Grenades, every model (even allied models) in base contact with the owner has -2 WS and -2 Init.
-Voidspitter - 35 pts-
Ranged, Assault 1, Torrent , Str 5, VP5, Ignore cover, Armourbane, Fleshbane
-Mask of Terror - 35 pts -
Fear, enemy units have -2 Ld within 6" of the bearer (cumulative with Supreme Anarchy), enemy who wants to shoot the bearer or his unit must take a Pinning test.
Here it is, just some chaff spitted around
I can suggest these two sources:
http://1d4chan.org/wiki/Codex_-_Malal_7e:_/tg/_edition
and
http://www.bolterandchainsword.com/topic/280162-chaos-supplement-followers-of-malal-rules/
OTHERWISE i have this shit houseruled by me:
Codex: Followers of Malice (FoM)
FoM treat all alliances as ally of convenience. Chaos Marines and Chaos Daemons are desperate allies.
FoM select units as per the Codex: Chaos Space Marines with the following differences:
-No named character (followers of malice rarely survive long and no famous villain will ever fight for them)
-No chaos Marks can be selected and any unit that already has a mark of chaos in their special rules cannot be selected.
Furthermore all units from C:FoM have "Preferred Enemy: Codex Chaos Marines, Codex Daemons and Codex Renegade and Heretics"
Also they have
-Supreme Anarchy: every unit not selected from a FoM detachment suffer a -1 Ld when within 6" from any FoM unit.
Every Infantry model can purchase this special rule :
-Wanderers: gain Move trough cover USR and Run moves are at +1" -- 2 pts / 5pts for ICs
They can select relics only from the following list:
-Parasite Flail - 35 pts -
Melee, Str user, AP 4, unwieldly, Daemon weapon, Rend, Fleshbane, Lifeleech*
*Lifeleech: when an enemy model is wounded by this weapon, the wielder can roll a D6: on a 5+ he regains a previously lost wound, up to his maximum.
-Fang of the Renegade -45 pts-
Melee, Str +1, Ap 3, Daemon Weapon, Master crafted, Kinslayer*
*Kinslayer: succesfull invulnerable saves taken against wounds inflicted by this weapon must be rerolled. Models with the "Daemon" USR cannot take invuln. saves against wounds inflicted by this weapon
-The Armour of the Halves -25 pts-
Fear, 2+ Armour save, count also as Defensive Grenades, every model (even allied models) in base contact with the owner has -2 WS and -2 Init.
-Voidspitter - 35 pts-
Ranged, Assault 1, Torrent , Str 5, VP5, Ignore cover, Armourbane, Fleshbane
-Mask of Terror - 35 pts -
Fear, enemy units have -2 Ld within 6" of the bearer (cumulative with Supreme Anarchy), enemy who wants to shoot the bearer or his unit must take a Pinning test.
Here it is, just some chaff spitted around
