[RPG] Does the Protection from Evil and Good spell protect against the Staff of the Forgotten One from Tomb of Annihilation

dnd-5emagic-itemspossessionspellstomb-of-annihilation

Under the item description of the Staff of the Forgotten One in the ToA Hardcover, we see that a spirit inside the staff might try to possess the wielder:

The Forgotten One. The bodiless life force of a dead archmage empowers the staff and is imprisoned within it. The rune carved into the staff’s skull protects Acererak from this spirit’s vengeance. Each time a creature other than Acererak expends any of the staff’s charges, there is a 50 percent chance that the life force tries to possess the staff wielder. The wielder must succeed on a DC 20 Charisma saving throw or be possessed, becoming an NPC under the DM’s control. […]

The Protection from Evil and Good spell can protect against some kinds of possession:

Until the spell ends, one willing creature you touch is protected against certain types of creatures: aberrations, celestials, elementals, fey, fiends, and undead. […] The target also can’t be charmed, frightened, or possessed by them. […]

If I were under the effect of Protection from Evil and Good, am I immune from getting possessed by the ghost of the staff?

Best Answer

Yes, I would argue you are immune.

While this is not explicitly called out by the description of the staff, I think the text of the staff's effect and the spell lean heavily toward your strategy working.

As you have pointed out, the spirit in the staff is explicitly attempting to possess the user, and Protect from Evil and Good explicitly protects against possession. This seems quite reasonable even though the staff did not call out this spell specifically in its description.

As additional support, the staff's description says that Dispel Evil and Good can be used on the affected creature to exorcise the spirit and force it back into the staff. The effects of Dispel Evil and Good and Protection from Evil and Good have significant similarities, with Dispel being a higher level with some additional affects, and both share the line about ending possession. Therefore I would expect that if Dispel is meant to be able to use its effect to dispel the spirit, Protection should be able to use the similarly-worded effect to protect from it.

These two points together make me think that Protection from Evil and Good should be sufficient protection from the spirit of the staff attempting to possess you.