The Aberrant Dragonmark feat states (E:RftLW, p. 52; WGtE, p. 112):

  • [...] choose a 1st-level spell from the sorcerer spell list. You learn that spell and can cast it through your mark. [...]
  • When you cast the 1st-level spell through your mark, you can expend one of your Hit Dice and roll it. If you roll an even number, you gain a number of temporary hit points equal to the number rolled. [...]

How long do these temp HP last?


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.


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