Title says it all, what is the greatest amount of temporary hit points a character can have at one time? I think it's 45 from using Armor of Agathys with a 9th level spell slot, but is more possible?
Anything in RAW is acceptable except the following:
- Weird wishes
- Epic boons
Answers should only consider temporary hit points, not hit point mitigation methods such as polymorph, warding bond, arcane ward, etc. An ideal answer would provide the maximum one can attain by a single character's effort and the maximum attainable with the aid of others (if it's higher).