Boon Of The Night Spirit
Source: Player's Handbook
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.