I’m working on a magic staff based on lore of the Hawthorn Tree. The staff has 3 properties which the users controls through the staff’s thorny hand. Effectively, the user can use charges to:
- Grapple and deal bonus damage on subsequent rounds (1 charge)
- Deliver necrotic damage and regain Hit Points, once per day (3 charges)
- Use the staff as the Mage Hand cantrip (0 charges)
Requires attunement by a cleric, druid, or warlock
This staff can be wielded as a magic quarterstaff that grants a +2 bonus to attack and damage rolls made with it. While holding it, you have a +2 bonus to spell attack rolls. This staff deals piercing damage rather than bludgeoning damage, but otherwise retains the normal properties of a quarterstaff.
The staff has 10 charges that can be used for the following abilities. Once per turn, the user can take 1 of the following actions while holding the staff:
Thorny Grasp. When you hit with a melee attack using the staff, you can expend 1 charge to grapple a target. On a successful hit, the tangle of thorny branches at the end of the staff forms a large hand and grasps the target. If the target is large or smaller, it is grapped (escape DC 17) and restrained until the grapple ends. On subsequent turns, while restraining the target with at least one hand holding the staff, you can use a bonus action to deal 1d6 piercing damage. Until this restraint ends, the user can't use the staff on another target.
Death’s Touch. When you hit a creature with a melee attack using the staff, you can expend 3 charges to force the target to make a DC 17 Constitution saving throw. On a failure, the target takes an extra 4d6 necrotic damage, and you regain a number of Hit Points equal to half that necrotic damage. This property can't be used again until the next dawn.
Helpful Hand. You can use your action to control the hand and perform simple tasks with a reach of 10 feet. The hand can't wield a weapon, activate magical items, or carry more than 30 pounds. This maneuver does not use any charges.
The staff regains 1d6 + 4 expended charges daily at dawn. If you expend the last charge, roll a d20. On a 1, the staff becomes a nonmagical quarterstaff.
Based on items in the DMG, this staff seems to fall somewhere between a Staff of Withering (rare) and Staff of Power (Very Rare). Is my estimation correct? Would lowering the DC to 15 from 17 also lower the rarity?