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DP flies with 10 WT gives Master of Union other WT hold or take objective DA holds mid with Terminators MoP advances to keep up with 10 Possessed Black rune Cursed earth pact def then warp marked smite for attack other 5 possessed take objective with MoE Helbrute and cultist hold back. Helbrute lascannons (Helbrute can be changed with venomcrawler at 10 point save.
Arks of Omen Detachment (Chaos - Chaos Space Marines) [104 PL, 2,000pts, 1CP]

Arks of Omen Compulsory Type: Elites

Battle Size [6CP]: 3. Strike Force (101-200 Total PL / 1001-2000 Points)

Detachment Command Cost

Game Type:5. Chapter Approved: Arks of Omen

Legion: Word Bearers

HQ

Daemon Prince with Wings [11 PL, 180pts, -2CP]: 4. Master of the Union, Death Hex, G'holl'ax, the Decayed, Hellforged sword, Mark of Nurgle, Stratagem: Relic, Stratagem: Warlord Trait, Warlord, Wings

Dark Apostle [6 PL, 115pts, -1CP]: Epistle of Lorgar, Gifts of Chaos ,Illusory Supplication, Omen of Potency, Mark of Slaanesh

2x Dark Disciple: 2x Close combat weapon

Master of Possession [6 PL, 105pts, -1CP]: Chaos Undivided, Cursed Earth, Gifts of Chaos, Mutated Invigoration, Pact of Flesh, The Malefic Tome

Troops

Cultists Mob [2 PL, 50pts]


9x Chaos Cultist w/ cultist firearm: 9x Cultist firearm, 9x Frag & Krak grenades

Cultist Champion

Auto-pistol and brutal assault weapon

Elites

Chaos Terminator Squad [19 PL, 400pts]: Mark of Slaanesh

Chaos Terminator Accursed weapon, Combi-melta

Chaos Terminator Accursed weapon, Combi-melta

Chaos Terminator Accursed weapon, Combi-melta

Chaos Terminator Accursed weapon, Combi-bolter

Chaos Terminator Accursed weapon, Combi-bolter

Chaos Terminator Accursed weapon, Combi-bolter

Chaos Terminator Accursed weapon, Combi-bolter

Chaos Terminator Accursed weapon, Combi-bolter

Chaos Terminator Accursed weapon, Combi-bolter

Terminator Champion Accursed weapon, Combi-melta

Helbrute [6 PL, 115pts] Chaos Undivided, Heavy flamer, Helbrute fist, Twin lascannon

Master of Executions [4 PL, 65pts]:Chaos Undivided

Possessed [14 PL, 280pts, -1CP]:Chaos Icon

9x Possessed: 9x Hideous mutations

Possessed Champion: Black Rune of Damnation, Trophies of the Long War

Possessed [7 PL, 140pts]: Possessed Champion

4x Possessed 4x Hideous mutations

Fast Attack

Warp Talons [14 PL, 280pts]: Warp Talon Champion

9x Warp Talon: 9x Warp claws

Heavy Support

Obliterators [15 PL, 270pts]

3x Obliterator: 3x Crushing fists, 3x Fleshmetal guns

Total: [104 PL, 1CP, 2,000pts]

I suggest you break up your warp talons, more units is better. Same with possessed, and put the book back on the terminators. That keeps the terminators as unbreakable.
Not sure on your plan with the obliterators, if they are drop in and die, or sit in terrain and hope they are durable enough to survive more than a turn.
You could mark your dreadnought with Tzeentch so it can ignore the first failed save. And it looks like you might have enough points to mark to master of executions. Though I do find it curious you didn't mark the MOP with slaanesh, because delightful agonies on your terminators is pretty awesome.
Your Dark Apostle is interesting, Epistle is great, but you chose omen of prophecy for 2nd power which is nice, but without the black mace, its not good enough. I'd choose combat apostle or support apostle, but not a mix.

my thoughts, YMMV