Well since 2 of the greater Daemons have been done i thought i'd throw out an idea i had for a 3rd. Feedback is welcomed:)

Keeper of secrets.

6 res 4 loyalty.(chaos)

Power 4 health 6

Counterstrike 4

Action you may corrupt 2 units you control to apply your counterstrike damage to one target after combat damage has been taken.

The basic thinking behind this is that in the fluff for warhammer the keeper is meant to be a fast lithe daemon that gets inside peoples defenses. I figured that at the expense of 2 other minions the keeper would be able to get another attack in. I personally think it's very balanced given it's overall cost and ability cost, what do you guys think?