Kuo-Toa

Races that are not Large nor have an innate flying speed gain an extra Feat of their choice. This Feat must be a "Full Feat".

Your character can speak, read, and write Common and one other language that you and your DM agree is appropriate for the character. 

You gain 3 ability points to increase any abilities of your choice. You can't increase a single ability by more than 2 with these points.

You have advantage in saving throws against being frightened and you can sense the presence of any creature within 30 feet of you that is invisible or on the Ethereal Plane. You can pinpoint such a creature that is moving.

You have a swimming speed equal to your walking speed and can breathe both air and water. Due to your slippery skin, you have advantage on ability checks and saving throws made to escape a grapple.

You have Darkvision out to 120ft. 

Your worship of one of the “True” Kua-Toan gods has granted you very real magic. You know the Mind Sliver cantrip. When you reach 3rd level, you can cast the Bane spell as a 2nd-level spell once with this trait and regain the ability to do so when you finish a long rest. When you reach 5th level, you can cast the Hold Person spell once with this trait and regain the ability to do so when you finish a long rest. 

You use your spell save DC or Mastery Save DC (your choice) for these spells. If you have a class feature that allows you to learn spells, you count these spells as known by that class. You always have them learned or prepared, and they don’t count against the number of spells you can learn or prepare.