Hi folks,
I'm trying to put together an Eldar Psyker list where the Psykers are not on bikes, and I'm toying with the idea of putting them in a Wave Serpent. Back in 5th edition (when I last played before 7th) although one could not place a psychic blessing or malediction on a unit that was embarked in a vehicle, if the psyker himself was in a vehicle (not open topped and with no firing points) he could still use powers out of the vehicle. I can't remember the reasoning, but I remember it was the case.
TL;DR, can psykers use powers on units on the table while they are in a vehicle?