James Gasik
We don't talk about Pun-Pun
There's a rule about stacking proficiency bonus, but if you couldn't stack ability modifiers twice, then a Paladin's Aura of Protection wouldn't help with the Paladin's own Charisma saves.I'd thought I'd read something that said you could add an ability modifier only once, but since I can't say for certain I'm remembering that correctly, I'm going with yes.
Edit: of course the only source I have on that is Crawford. Believe it or don't, lol. Explained here.