Shade

Your mutated lifeforce grants you the following features:

• Increase your Intelligence, Dexterity, or Constitution score by 1, to a maximum of 20.
• You learn the darkness spell and the longstrider spell. You can cast each of these spells without expending a spell slot and longstrider can be cast as a Bonus Action. Once you cast either of these spells in this way, you can’t cast that spell in this way again until you finish a long rest.
• While you can see the sun, you cannot gain advantage on attack rolls
• While you cannot see the sun, you cannot gain disadvantage on attack rolls and your movement increases by 5ft.

Shades must feed on the lifeforce of a willing creature once every 3 days. If you do not feed, your appearance changes into that of a ghastly figure with razor sharp teeth and an extended jaw. Also, your fingers become elongated claws wreathed in darkness. When you are in this form, you cannot add any +modifiers to Charisma checks and you cannot gain advantage on Charisma checks. If you attempt to feed on an unwilling host or convince the host by any magical or threatening means, you do not absorb the life force of the host and cannot attempt to feed from the same host for 12 months. Lastly, the host must not be a fellow Shade, or a member of another Subrace. Attempting to do so will cause instant and irreversible death to you.

A Shade can originate from any race. Once you have become a Shade, your maximum life expectancy triples and you age at 1/3 of the usual rate.