Gift of the Ever-living Ones
Prerequisite: Pact of the Chain feature
Description not available (not OGL).
But here is a summary:
When you roll dice to regain hit point within 100 ft of your familiar, take the maximum value of all dice.
Xanathar´s Guide to Everything
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DnD 5e Eldritch Invocations › Gift of the Ever-living Ones