Fomorian's Curse

You have developed traits similar to those possessed by a fomorian, granting you the following benefits:

• You gain proficiency in Stealth.
• You gain darkvision out to a range of 120 feet.
• You gain fluency in Undercommon.
• As an action, you can force a creature that you can see within 30 feet of you to make a Charisma saving throw (DC 8 + your proficiency bonus + your Constitution modifier). On a failed save, the target takes 1d8 psychic damage, or half as much on a successful one. This damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8). Alternatively, instead of dealing damage you can curse the creature with magical deformities, for 1 minute. While deformed, the creature has its speed halved and has disadvantage on ability checks, saving throws, and attacks based on Strength or Dexterity. A deformed creature can repeat the saving throw at the end of each of its turns, ending the effect on a success. You can use this feature to curse a creature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.