I have a PC who wants to use this trait except he believes it is +1 per die of damage but the SRD says it is just +1 damage. To add to the confusion I have seen people refer to this trait on the boards here as +1 per die. Is there errata that changed the trait one way or the other? Seems very powerful for a trait as it is the equivalent of a sorcerer bloodline power. Thanks for any clarification provided.
Elemental Pupil is just +1 damage. It is not +1 damage per die, and that is most definitely not the intention for it. Rogues do 1 extra point of damage when sneak attacking with their trait. Not 1 extra point per sneak attack die, just +1.
I see where you saw the idea that Elemental Pupil is +1 damage per die, and Zephyre Al'dran is incorrect.