Hello! I have a player who wants to play a character with a variable CR template like Half-Celestial. We have been doing it where for every CR +1 adjustment is 1 level behind. I’m not sure exactly if that’s how we are suppose to do it. There is no real clarification I could find. I have also looked at the rules for playing a monster and adjusting their CR and the levels you gain. Does that apply to templates? Like if we have someone with a template of CR +2 like vampire do they lose two levels and do they gain back another level after three equal up to half of their monster “CR”? So if we are playing a level 14 game would a half celestial be level 11 or would it be something higher? Clarification this would be much appreciated thank you.
Pathfinder has no official rules I'm aware of for templates that increase CR for player characters. these are meant for monsters, as CR is a gauge of opponent effectiveness, not player effectiveness.
You're in houserule territory