This is a Gift of Damnation you can receive from the Devilish Contractor Boon.
When a creature you can see within 30 feet of you fails a saving throw, you can use your Reaction to gain Temporary Hit Points equal to 1d10 plus your Transformation Stage. You regain the use of this gift when you finish a Short or Long Rest.
If you roll a 1 on the die, you gain no Temporary Hit Points and instead have the Prone condition.
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