The description of the create bonfire cantrip says:
You create a bonfire on ground that you can see within range. Until the spell ends, the magic bonfire fills a 5-foot cube. Any creature in the bonfire’s space when you cast the spell must succeed on a Dexterity saving throw or take 1d8 fire damage. A creature must also make the saving throw when it moves into the bonfire’s space for the first time on a turn or ends its turn there.
It seems like you could damage a creature twice in the same turn by having them enter the bonfire's space and then end their turn there. However, I'm not sure how it works with more complicated events, like casting it on a turn, then using forced movement to make them leave and reenter the same affected space on the turn you cast it (e.g. casting create bonfire, then using Action Surge, followed by a grapple and movement).
I also haven't figured out how the Scout rogue's Skirmish feature could affect this…
Can the create bonfire cantrip damage a creature more than once per turn, by RAW? If so, how many times at most?
Does being in the targeted space during the initial casting even count as entering for the first time on a turn?
Best Answer
Yes (max is 3)
There are 3 triggers: When you cast, when they enter for the first time on a turn, and when they end their turn.
So yes if they enter and then end their turn there, they would have to make the save twice.
3 is the max because you could cast the spell during their turn as a reaction, then somehow have them leave and re-enter, and then end their turn there.