I was playing a Grey Knights List and his Grand Master had the Ability that drops your Int by 1 if you are in base to base contact with him.
Since I don't play Grey Knights I don't know if they are missing any of the details on the ability.
After the game I played as I was leaving another person at the shop said that the incense ability only affects demons? or do it effect anyone in b2b contact with the Grand Master?
I had a Normal Chaos Lord(Slaanesh) in b2b contact with him, and not a demon in the fight.