Quote Originally Posted by Cadian 9th View Post
No serious, Psionics works. Just make it you have to concentrate to avoid being attacked by daemons etc. Use the mishap rules for the misuse of Dojores from the XPH.
It's not even that much of a risk since after the Age of Strife, all sanctioned Psykers (the one that actually use their powers) pass through the Adeptus Astra Telepathica, and the weak willed are weaded out (or fed to the Emperor). Only during Chaos intrusions or serious warp tearing is it normally possible for trained Psykers to be possessed. As for untrained Psykers, then the risks are higher.

And on the whole Imperium thing. First of all, you're only talking about the devout. Most humans don't give a darm about the imperium in actual law, even if they revere the emperor. I had a campaign setting which was Medusa four, which, after a catastrophic event the planet was broken and parties of all races interacted without the first instinct being to destroy everything they meet. It was plausible. Eldar actual do work alongside humans. There's even a term for them, they're called outcasts or pirates.

Dante
Yes but in that example, none of the important factions of the Imperium are in play (Inquisition and Adeptus Astartes). Those factions absolutely refuse to work with Xenos, unless their survival depends on it (and even then, they refuse sometimes). Eldars help humans when it helps ensue their own survival. They would sacrifice millions of human lives if it could save a single of theirs. As for the pirates, they only help them because it's profitable for them, and have not real loyalty towards the "lesser" races.

However, it still represents one of the best scenarios for getting a diverse party together (the others one being a Tyranid or Necron invasion).