Hi there fellow GMs!
I have a psyker in my warband who tends to solve EVERYTHING with mind control. Last session they where facing an Ork and a Dark Eldar. He of course used his mental abilities on the xenos. I increased difficulty a little bit for the alien minds he was looking in, but apart from that i let it work as usual. I'm not sure if he should gain some insanity or even corruption points for having looked into xenos minds repeatedly.
What is your opinion? Should this even be allowed or do these powers only work on humans? How hard should it be compared to a human. Should there be insanity/corruption?