It says in p179 in the DH rulebook that if a psyker uses a telepathic power on a target who has twice his corrpution or insanity points bad things could happen.

The thing I'd like to discuss is, could you force this into unwilling victims? for example if psyker A has 20 corruption points and person B the" victim" would have 0, would the victim have to make WP checks to risk corruption if person A contacted him with a telepathic power.

Also could you resist a telepatchic communication attempt? would a mundane person even detect it? I would propably allow it in my games, but how other gm's see this is interesting.

At the moment this sort of psychic **** would be an ideal tool for an enemy psyker to use on the acolytes. Far more subtle than mutating the flesh for example. I think that it would fit the feel of 40k also. Imagine a rogue psyker with telepathic power and lots of corrpution, what kind of weapon it would make to brake down the society of man. Seeding mental corruption on a planetary scale for example.

It just occured to me that even if a groups psyker would use telepathy as a communication method, he could seriously risk contaminating his fellow acolytes. Especially since in my game I don't tell the players how many insanity or corruption points their characters have.

thoughts, anyone?

Sounds good to me, a particularly corrupt Magus could recruit new followers by corrupting them telepathically.

Anyone with a GM called Dan, stop reading this post and skip to the next...you know who you are...

Thats an idea I hadn't thought of...I might employ this in the mission my group will be starting this week - they have to infiltrate a cult to work out if it's connected to the appearance of corpses around a hive

I always viewed it as reading a book. If the book was full of warp runes and chaos ramblings, then the reader would likely crack. However, it doesn't matter how twisted and evil the reader is, it won't affect the book. Obviously there may be ways around this, like taking a magic marker to the book, but those are with a twisted and malicious intent, not just an accidental thing. And always remember, just because a good idea for a psyker power (sharing your corruption/insanity with others) isn't in the book doesn't mean you can't write one up for storyteller approval.