Sword of the Serpent

Sword of the Serpent is a magic item (weapon) of very rare rarity.

You gain a +2 bonus to _attack and damage rolls_ made with this magic sword. When you hit with this weapon, you deal an extra 1d6 poison damage. The sword has 3 charges and regains all expended charges at dawn. While wielding the sword, you can use an action to expend 1 charge and cast __polymorph_ on yourself, transforming into a _giant poisonous snake_ . While in this form, you retain your Intelligence, Wisdom, and Charisma scores.