Fashioned from twisted ash wood, this staff 's head is carved in the likeness of a serpent preparing to strike. You have resistance to poison damage while you hold this staff. The staff has 10 charges for the following properties. It regains 1d6 + 4 expended charges daily at dawn. If you expend the last charge, roll a d20. On a 1, the carved snake head twists and magically consumes the rest of the staff, destroying it. Spells. While holding the staff, you can use an action to expend 1 or more of its charges to cast one of the following spells from it, using your spell save DC: cloudkill (5 charges), detect poison and disease (1 charge), poisoned volley (2 charges), or protection from poison (2 charges). You can also use an action to cast the poison spray spell from the staff without using any charges. Spells marked with an asterisk () can be found in Deep Magic for 5th Edition. Serpent Form. While holding the staff, you can use an action cast polymorph on yourself, transforming into a serpent or snake that has a challenge rating of 2 or lower. While you are in the form of a serpent, you retain your Intelligence, Wisdom, and Charisma scores. You can remain in serpent form for up to 1 minute, and you can revert to your normal form as an action. Once used, this property can’t be used again until the next dawn.