Sob a descrição do item do Cajado do Esquecido na ToA Hardcover, vemos que um espírito dentro da equipe pode tentar possuir o portador:
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. [...]
O Proteção do Mal e do Bem feitiço pode proteger contra alguns tipos de posse:
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. [...]
Se eu estivesse sob o efeito de Proteção contra o mal e o bem, estou imune a ser possuído pelo fantasma da equipe?