[Arcticor]

With the amazing bonuses provided by the detachments, I couldnt help but make this list. (Also, I love destroyers and this list is a somewhat-tribute back to 2 codecies ago when the only viable builds were wraithwing and destroyer wing) Using the Mephrit Dynasty rules, 2001 points (1 point over, sue me).

Reclamation Legion:
-CCB w gauss, OL with Edge of Eternity, Res orb, phase shifter 205
-5x Gauss Immortals, Night Scythe 215
-3x Tomb Blades, nebuloscopes and particle beamers 66
-10x Warriors, Ghost Ark 235
-10x Warriors, Ghost Ark 235

Annihilation Nexus:
-Annihilation Barge 120
-Annihilation Barge 120
-Doomsday Ark 170

Destroyer Cult:
-Destroyer Lord, The Solar Staff 125
-3x Heavy Destroyers 150
-3x Destroyers 120
-3x Destroyers 120
-3x Destroyers 120

The plan is for the CCB to run up and charge the next turn (duh). If it gets hit with a meltagun or something equally scary, I'll pop the rez orb and take the hit on the OL for a 4++ with 4+ rerolling reanimation (I play lots of tau, so I can't rely on jink for cover saves when I'm within charge range). Gauss Immortals and tomb blades go after far away objectives, and blades hurt things that are in deep cover. The arks and barges just kinda do their thing. Now the destroyer cult... this is the main thing that will frustrate my opponent with 3+ to hit w/ preferred enemy and rerolling ALL wounds and armour pen results, as well as jump shoot jump and the increased durability of destroyers. Things will die. The destro lord will chill with the heavy destroyers and pop the solar staff if they're going to take heavy fire next turn (like if I cant make it back behind LoS blocking terrain for some reason), since I feel like they'll be focused on the most. Thoughts? I really feel like the decurion detachments have tons of potential.
-Arcticor

 

[StrykerBoh]

Having played in a rather large tournament recently with a very similar list to yours, I can tell you that the destroyer cult is super cool and rather tanky, it just doesn't have enough punch to carry you to victory. They will get focused fired more often than not as well. I have not used the Anni Nexus yet so I cant say how effective it is. The formation I've had the most success with is the Canoptek Harvest. Wraiths being T5 now is HUGE. Add in the ability to give them RPs, Decurion rules modifying them to a 4+++ is stupidly good, paired with their 3++ saves already. Hope I gave you some ideas to think about!

 

[Xabre]

Confused.

Mephrity Dynasty is a Detachment. You can't use their rules for a Decurion. Decurion is... well, the Decurion. Its own rules, own restrictions. The Mephrit Dynasty requires an HQ and 3 Troops. Since you are only using Decurion Formations, you never qualify the Mephrit. I actually posted something in here a couple weeks ago that would show the difference; it was a Mephrit Dynasty Detachment and I added a Royal Court.

 

[falcoso]

Confused.

Mephrity Dynasty is a Detachment. You can't use their rules for a Decurion. Decurion is... well, the Decurion. Its own rules, own restrictions. The Mephrit Dynasty requires an HQ and 3 Troops. Since you are only using Decurion Formations, you never qualify the Mephrit. I actually posted something in here a couple weeks ago that would show the difference; it was a Mephrit Dynasty Detachment and I added a Royal Court.

I believe it is a Mephrit Dynasty relics in a Decurion detachment. Whether that is possible has always seemed like a grey area to me as there doesn't seem to be much detail on the topic in the supplement

 

[Xabre]

'Certain units chosen from the Mephrit Dynasty Detachment and Formations can also make use of the Relics and Warlord Traits listed below'

Feels pretty cut and dry to me. At the very least, I'd assume Edge of Eternity OR Solar Staff. No dipping for both weapons in one force.

 

[falcoso]

'Certain units chosen from the Mephrit Dynasty Detachment and Formations can also make use of the Relics and Warlord Traits listed below'

Alas it would appear I need to learn to read! Good spot.