You have begun to manifest a demon mark due to your race. You gain the following benefits when the mark fully manifests:
- Increase your Constitution score by 1, to a maximum of 20.
- You learn a cantrip of your choice from the sorcerer, warlock or wizard spell list. In addition, choose a 1st-level spell from the sorcerer, warlock or wizard spell list. You learn that spell and can cast it through your mark. Once you cast it, you must finish a long rest before you can cast it again through the mark.
- Constitution is your spellcasting ability for these spells.
- When you cast the 1st-level spell through your mark, you can expend one of your Hit Dice and roll it. If you roll an even number, you gain a number of temporary hit points equal to the number rolled. If you roll an odd number, one random creature within 30 feet of you (not including you) takes force damage equal to the number rolled. If no other creatures are in range, you take the damage.
You also develop a random flaw from the Aberrant Demon Mark. Roll a d6 to determine.
1. Your Mark is a source on continuous pain
2. Your mark whispers to you throughout the day until dawn the following day every time you use your mark.
3. The skin around your mark is scared and deformed.
4. Animals are uneasy around you and become frightened.
5. You have mood swings every time your mark is used.
6. Your look changes slightly whenever you use the mark. Bringing out more demonic features.
Option: Greater Demon Powers
At the DM's option, a character who has the Demon Mark feat has a chance of manifesting even greater power.
Upon reaching 10th level, such a character has a 10 percent chance of gaining an epic boon from a High Demon Lord. If the character fails to gain a boon, they have a 10 percent chance the next time they gain a level.
If the character gains a boon, the DM chooses it or determines it randomly. The character also permanently loses one of their Hit Dice, and their hit point maximum is reduced by an amount equal to a roll of that die plus their Constitution modifier (minimum reduction of 1). This reduction can’t be reversed by any means.