Because a person who plays Pure Khorne cant gain the powers from psyker ability due to Khorne not having any sorcerers unless they take undivided but that would make them not pure Khorne so I have this idea.
Chaos Space Marine : Ritualist (HQ)
Using the dark Apostles stat line with some difference's WS5 BS4 S4 T4 W2 I4 A2 Ld9 Sv+6
Special rules and wargear : Zealot, Autopistol, Improvised armour, Champion of Chaos, Independent Character and as listed below Blood of the enemy
He may swap his autopistol for a ranged weapon from the wargear
He may take Chaos Rewards
He can take marks of Chaos from the wargear
He can take Veterans of the long war special war for 5 pts
He is a psyker mastery level 1 for 25pts can be made a psyker mastery level 2
he can only take powers from demonology Malefic powers
If he roles double 1,2,3,4,5 he can kill a model in his unit to remove the effect of perils of the warp but double 6 applies as standard to the ritualist.
Blood of the enemy if the ritualist kills a enemy character he can roll chaos boon table for a nearby model in his unit instead of himself.
This would be very fluffy in the basis of Aztec blood sacrifice.
Chaos daemons : Blood Throne of Khorne another entry to be added for every model that is slain by the blood throne and the herald in the assault phase roll a d6 at the end of the assault phase on a 5+ for each dice is a blood letter when all the results are done all those blood letter become a unit and are deployed 6" away from the blood throne with no scatter but must be 1" from any model friend or foe.
This would be very fluffy in the basis that Khorne is happy with his minion slaying his foe in his name and reaping the skulls from there victims.
This will make people feel more on par with the other chaos gods because all the other pure army's can use summoning wile Khorne cant when playing a pure list and make the blood throne more attractive.
Please stay away from flaming and if there is a problem give a example of how it could be improved or what would make it Over powered and find a way to lower that Over powered factor.