Force Grey are dispatched by the Blackstaff to the jungle continent of Chult to locate and destroy the "Soul Monger", which is trapping the souls of the recently-departed and causing those who've been resurrected by magic to slowly rot and wither away. Joined by a local guide, the team venture into the jungle to find the Soul Monger's resting place, the fabled Lost City of Omu, and confront whatever dark power is behind it all.