race features:
Poison Resistance: You are resistant to Poison damange and have advantage on all saving throws involving being Poisoned.
Stinger: You tail has a stringer on the end on it. You are able to make a melee attack with your tail, doing 2d8 piercing damage plus 1d6 poison damage. The damange of the poison increases at 5th (26), 10th (3d6), 15th (4d6) and 20th level (5d6).