Boon of the Night Spirit

Source: D&D 5.2 SRD Player Characters

Epic Boon Feat (Prerequisite: Level 19+)

You gain the following benefits.

Ability Score Increase. Increase one ability score of your choice by 1, to a maximum of 30.

Merge with Shadows. While within Dim Light or Darkness, you can give yourself the Invisible condition as a Bonus Action. The condition ends on you immediately after you take an action, a Bonus Action, or a Reaction.

Shadowy Form. While within Dim Light or Darkness, you have Resistance to all damage except Psychic and Radiant.