race features:
Nematocyst
You have a long, barbed appendage, a natural weapon which you can use to make unarmed strikes. If you hit with this finesse weapon, you can deal piercing damage equal to 1d4 + your Strength or Dexterity modifier (your choice), instead of the bludgeoning damage normal for an unarmed strike.
Neurotoxin
As a bonus action, you can secrete a toxin and apply it to one weapon or piece of ammunition, which lasts for 1 hour. The first time you hit a creature with this weapon or ammunition, the creature must succeed on a Constitution saving throw (DC equals 8 + your Constitution modifier + your proficiency bonus) or be paralysed until the start of its next turn.
Alternatively, you can use a bonus action to inject the toxin when you hit a creature with your nematocyst. You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.
Toxic Adaptation
You have advantage on saving throws against being poisoned, and you have resistance to poison damage.