19

This is answered on page 198 of the PHB or here in the basic rules: Temporary Hit Points ... Unless a feature that grants you temporary hit points has a duration, they last until they're depleted or you finish a long rest.


7

A creature can have Mass Polymorph cast on them to gain 157-247 temporary hit points Each target assumes a beast form of your choice, and you can choose the same form or different ones for each target. The new form can be any beast you have seen whose challenge rating is equal to or less than the target's (or half the target's level, if the target doesn't ...


2

As far as I can tell using only the free basic rules on D&D Beyond, the optimal build so far for this is sorcerer or wizard 17+, with the spell false life cast using a 9th level spell slot. The minimum temporary HP this gives is 45, average is 46.5, and the max is 48. I don’t think there’s a single spell or anything that does better, since temp HP don’t ...


1

If Unearthed Arcana is permissible, then as a Wild Soul Barbarian, it's possible to attain a theoretically infinite number of Temporary Hit Points ... Although in practice there's an upper limit constrained to what creatures the DM is willing to surround a Barbarian with. On their Wild Surge table, a roll of [1] results in the following: "Necrotic ...


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