Let's go with formations then:
War cabal:
1 Ahriman, Daemon Prince, Exalted Sorcerer or Sorcerer
1-3 Rubric Marines
1-3 S O Termies
1-3 Exalted Sorcerer or Sorcerer
Benefits:
If formation is maximezed in number of units, reroll 1's to sabe.
I a Psyker manifest one power, during the next Psychic phase the Psyker and his unit may reroll 1's to hit
War Coven
1 Daemon Prince, Sorcerer or Exalted Sorcerer
3-9 Sorcerer of Exalted Sorcerer
Benefits:
Same as War Cabal (reroll 1's to sabe when max)
The formation may choose one of the psychic disciplines of the BRB and cast those powers with 3+, instead of 4+.
Tzangoor warheard
1 Sorcerer or Exalted Sorcerer
3 units of Tzangoors
0-6 units of Tzangoors or Spaws
Benefits:
Fleet
Reroll to save 1's when max
Tzangoors may run and charge. If charge distance is 9 or more, +1S and +1I.
Sehkmet Conclave
1 Sorcerer, Exalted Sorcecer, Daemon Prince, Ahriman or Magnus
3-9 Units of Scarab Termis
Benefits:
Fear
Reroll 1's to sabe if max
Units in this formation have +1T if they are at 6" of any other 2 units of this formation.
Ahriman Exiles
Ahriman
3-9 Exalted Sorcerers
Benefits:
Reroll 1's to sabe if max
Ahriman and any sorcerer at 18" cast powers with 3+.
Rehati War Sect
Magnus
3-9 Daemon Prince, Exalted Sorcerer
Benefits:
Reroll 1's to sabe if max
If at 18" of Magnus, the formation cast powers with 3+, and have line of sight with every unit in the battlefield.
There are 2 Aux Formations (aparto from the already mentioned)
Daemon Engines: 1 Defiler, Forgefiend, Helbrute, Heldrake or Maulerfiend
Legion Armoury: 1 Chaos Land Raider, Predator or Vindicator
