You have made a contract with a Shadowy Creator from the Abyss.

Shadow Essence. You gain darkvision with a range of 60 feet, and you have an advantage on Dexterity (Stealth) checks.

Devil’s Sight. Magical darkness doesn’t impede your darkvision.

Creeping Darkness. As an action, you can cast darkness at a point within 120 feet of it, requiring no spell components or concentration. Wisdom is its spellcasting ability for this spell. While the spell persists, you can move the area of darkness up to 60 feet as a bonus action.

Shadow Stealth. While in dim light or darkness, you can cast Invisibility as an action.

Curse.  This mark will grant you more power if you adhere to your new patron's wish. You can forbidden to divulge anything about your patron or its wishes. You can refuse your patron's orders but must make a contested Wisdom saving. On a success, you can act as you please. On a fail, you will take 2d6 Psychic damage, and this damage will keep scaling up every time you refuse your patron. 

New Flaws.

• Your thirst for knowledge has grown, so you are willing to sacrifice others for that knowledge.
• You have a curiosity for taboo information.

Patron's Request

1. See to it that the set of magical locks of Metatron's Cube is unlocked. 

Notes: Sense: Darkvision, Advantage: Stealth