as a bonus action on your turn, if you have both hands free, you can increase your walking speed by 5 feet until the end of your turn 

your fanged maw and constricting serpentine body are natural weapons, which you can use to make unarmed strikes. if you hit with your bite, you deal 1d4 + your str mod, and your target must make a con save (dc 8 + your proficiency bonus + your con mod). on a failed, the target takes 1d4 poison damage

you are immune to poison and you cant be poisoned

you gain proficiency with the poisoners kit