Bow of the Viper
You gain a +1 to attack and damage rolls while wielding this weapon. As a bonus action, you can expend 1 charge to poison one arrow suitable for the bow for 1 minute or until it is used to damage a creature When a creature is damaged by the blade’s poison, it makes a DC 15 Constitution _saving throw_ or takes 1d10 poison damage and becomes _poisoned_ for 1 minute.
Alternatively, you can use an action to expend 2 charges to cast the following: _protection from poison , shillelagh_ (transforming the bow into a snake-headed _1 quarterstaff_ ), _thorn whip_ (causing one of the bow’s snake heads to lash out).
The bow of the viper has 4 charges and regains 1d4 expended charges each dawn. If you expend the last charge, roll a d20\. On a or 5 or less, it can no longer regain charges and becomes a _1 longbow_ .