So, this list would be taking advantage of the new Formations rules that came alongside Be'lakor (in essence allowing a Primary Detachment, an Allied Detachment, and an Allied Formation). So, without further ado...
HQ

Karios Fateweaver 300

Great Unclean One 290
-----Exalted Reward
-----Greater Reward
-----Mastery Level 3
Troops

10 Plaguebearers 90

10 Plaguebearers 90
Heavy Support

Daemon Prince of Nurgle 335
-----Greater Reward (2X)
-----Wings
-----Armor
-----Mastery Level 3

Daemon Prince of Nurgle 335
-----Greater Reward (2X)
-----Wings
-----Armor
-----Mastery Level 3

Daemon Prince of Tzeentch 355
-----Greater Reward (2X)
-----Lesser Reward
-----Wings
-----Armor
-----Mastery Level 3
CSM Allies

Daemon Prince of Slaanesh 305
-----Burning Brand of Skalathrax
-----Gift of Mutation
-----Wings
-----Armor
-----Mastery Level 2

10 Cultists 50
Allied Formation

Be'lakor 350
Army Total: 2500
So, all psykers roll on Biomancy except the
CSM Slaanesh prince, who rolls once on Lore of Excess and once on Telepathy. Be'lakor trolls with Telepaty powers.
GUO takes Grimoire, and Nurgle princes take baleswords if they roll bad on Greater table. Tzeentch prince takes Staff for his lesser.
What do you guys think? Not going to be taking this outside of my circle of freinds, as its either too troll-tastic to use against people who dont already like me

... or its just poorly designed.