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This is a first draft.

All models that have a mark of chaos use Tzeentch as such unless stated otherwise.

Battalion detachment - Demons of Tzeentch

HQ (183pts)
The Changeling
Herald of Tzeentch, Staff of Change

Troop (111pts)
Horrors
9 Brimstone, 1 Pink
Horrors
9 Brimstone, 1 Pink
Horrors
9 Brimstone, 1 Pink

Spearhead Detachment - Alpha Legion

HQ (189 pts)
Demon Prince, Wings, 2xMalefic Talons, Warlord-Unholy Fortitude, Warp Bolter, Warp Time

Heavy support (1170 pts)
3 Obliterators
3 Obliterators
3 Obliterators
3 Obliterators
3 Obliterators
3 Obliterators

Battalion Detachment - Alpha Legion

HQ (227 pts.)
Lord, Jump Pack, The Black Maze
Sorcerer, Jump Pack, Force Axe, Diabolic Strength, Weaver of Fates

Troops (120pts.)
Cultists
9 Cultists , 1 Champion
Cultists
9 Cultists , 1 Champion
Cultists
9 Cultists , 1 Champion

Total: 2000 pts, 17 drops with 8 deep strikes if desired, 10 CP

The horrors wrap around the blobb of doom consisting of Obliterators surrounding the changeling which grants a -2 modifier for everything shooting at them from more than 12" away.
If need be, the cultists help with the wrapping otherwise they camp objectives.
Characters provide rerolls and some psy stuff. They main purpose is to counter strike. The herald gives obis S6, for good measure. Oh and he fills the battalion. If I cut the pink horrors the herald could get a disc but I doubt the DP needs the +1S that badly.

I can see where you are going with this I just don't think you have enough screening units. 30 brimstones(btw 9 brim+1blue = 32 pts * 3 = 96,you are paying 15 pts more than needed) just won't cut it for the oblits as I assume the cultists are for objective grabs outside changeling aura otherwise they would just be more brimstones. which I think still might be better as such anyway for the invul.

Also unless spammed heralds really are pretty bad, and even then malefic lords are the cheapest way to spam that. and I get weaver of fate is cool but there are way too many oblits to pick just one easy one as it will just get ignored, that spell is really for big guys to get even bigger. I think your pan was to cast it on the lord but I have a suggestion that would replace that need.

If you took out the entire second battallion with cultists, lord, and sorc along with your herald you could change your first battalion to:

Changeling - 100
Bel'akor - 240

19 brimstone + 1 blue horrors - 62
19 brimstone + 1 blue horrors - 62
19 brimstone + 1 blue horrors - 62
19 brimstone + 1 blue horrors - 62
16 brimstone + 1 blue horrors - 53

This gives you a much larger troop screen/bubble along with massive board control as you can just branch a 20 man off and conga line to objectives while staying in changeling range. Bel'akor abuses character status and maneuvers to assassinate where needed.

Yes you lose 3 CP but It gives you a much more solidified plan that is much harder to interrupt.