i have a player who want to develop new télépatic power and i have no base to tell if the power is too strong or if i should tag it a minor power or a major power.

I did not find any information to how create new power for psyker

is there any information somewhere or someone know how to ??

Tanks

What does it do?

There isn't really a way to tell off-hand, because psychic powers can be broken pretty easily.

In general terms minor powers should have very small effects. While major powers go pretty much as powerful as wanted.

Of course they can also have huge thresholds.

What do you mean by develop? If he havs just invented new power, you/he can post it here and wait for feedback. If a lot of people judge new power, you would have quite an idea if it's to weak/al right/to strong/broken and if it needs to be fixed somehow.