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
  1. DnD 5e Eldritch Invocations › Gift of the Ever-living Ones