Spirit Box is a recoverable trap that roots a corporeal target, lowers spirit resistance, and summons a random local non-corporeal entity to possess or attack them.
Dozens of identical Spirit Boxes cover the foggy settlement streets. Carl identifies and disarms one before the first ghommids arrive, adding it to his inventory.
A triggered box roots its victim for sixty seconds and lowers resistance to spirits. It then draws a random non-corporeal entity from elsewhere in the area directly onto that victim, where possession may become permanent.
Carl casts Tripper to trigger the remaining traps before the party runs, scattering many ghommids to random boxes. One summons an owl-shaped entity immediately in front of him and leads to his frozen-arm injury.
A concealed spectral trap marked by a faint box outline and cold spirit light beneath the street.
Spirit Box turns the settlement's own population into an ambush and can also redistribute the horde when deliberately triggered.