[@Necroes][@Klomster] To wit, it does bear mentioning that, at least regarding Imperial psykers, a talent exists called Rite of Sanctioning, representing exactly what it sounds like, that essentially grants the bearer the ability to pick one Psychic Phenomena to suffer from in place of whatever they initially rolled, as long as they didn't roll Perils of the Warp. Even then, manifesting a Peril is 75+ on a 1d100... which is a 1-in-4 chance of a Peril instead if you get the Phenomenon, admittedly, but having three out of four rolls on that chart automatically result in a comparatively harmless effect is better than nothing, and if you roll at Unfettered strength, you still only get a Phenomenon if you roll doubles, i.e. about 10% chance to get a Phenomenon.

That said, it ought to be the case that a xeno psyker of equivalent skill to a Sanctioned Psyker is more than capable of doing a similar thing, essentially apeing the Rite of Sanctioning feat in a sense. So, if Urgrugg does manifest a Psychic Phenomenon, it could well be something minor consistently, such as all noises echoing bizarrely for a few seconds, or a faint breeze blowing past everybody and briefly making them feel like doom is about to befall them. On the other hand, if he manifests a Peril, he rolls the same as everybody else, whatever might happen.

(Oh also Pushing a psychic power only grants +3 Psy rating, not double Psy rating. So you know, Klomster.)