So, simple situation. Synthesist summoner. My player wants to play one, but there's a few things that he finds awkard:
First of all, temporary HP. It cannot be healed by anything, ever. The fused link function is the only exception, and can only be triggered when the temp HP reaches 0 (there's no clause for allowing the drain before that, meaning he can't heal it up between combats without literally stabbing himself, which RP-wise, he wants to avoid).
We came to the conclusion that, for a synthesist, the spell Rejuvenate Eidolon would target the eidolon (since it's not targeting a creature type, it's targeting the eidolon) and then would apply the healing to the summoner, since they are targeted together and functionally share an HP pool.
He wants to know if, instead, he can have Rejuvenate Eidolon heal the temporary HP (and thus be the only way to do so outside of self-mutilation).
Is there a corner case where this could get abused, and is this grossly overpowered in a way we are not realizing immediately?
