This gnarled and twisted oak staff has numerous thorns growing from its surface. Green vines tightly wind their way up along the shaft. The staff can be wielded as a magic quarterstaff that grants a +1 bonus to attack and damage rolls made with it. 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 thorns immediately fall from the staff and it becomes a nonmagical quarterstaff. 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: barkskin (2 charges), entangle (1 charge), speak with plants (3 charges), spike growth (2 charges), or wall of thorns (6 charges). Thorned Strike. When you hit with a melee attack using the staff, you can expend up to 3 of its charges. For each charge you expend, the target takes an extra 1d6 piercing damage.