Stinger

Replace one of your racial feat with this feat if you pick this feat. You have a stinger either on your arm,leg or abdomen. The stinger counts as a simple melee weapon with which you are proficient. You can attack with your stinger as

an action, a bonus action or a reaction. On hit your stinger deals (1d20 + 2 of your highest ability modfiers + your proficiency bonus) piercing or poison damage

( choose when you attack ) After the attack you take 

( 1d6 - 1 ) Level(s) of exhaustion.