Scarf of Serpents

Once per day this scarf can summon a hissing mass of snakes that surrounds and protects you. For the duration of the spell, your AC increases by 2 and you can use a bonus action to attack an adjacent creature with the snakes. Make
a melee spell attack. If it hits, the creature takes 3d6 poison damage and is poisoned. The poisoned creature must make a Constitution saving throw at the end of each of its turns; a successful save ends the poisoning.