An Environ is a type of Challenge in exploration scenarios. Environs usually cannot Move and typically cannot be seen from adjacent unblocked regions, but the DM or scenario design may specify exceptions to this.
Environs act first in turn order, and their Actions always target all PCs in their occupied region unless otherwise specified. Scenario design will specify if an Environ is also able to target certain other Challenges. If an Environ occupies multiple regions, it can target PCs in all occupied regions on each turn; in most cases, however, this is implemented through multiple copies of an Environ instead, who each target individually (mostly to account for localized effects applied to the Environ).
Environs ignore rules for illumination and visibility, though targets may still suffer penalties if they cannot see the Environ.
Environs ignore water & swimming rules.
Environs start with a -1 in each Stat Track.
Each Environ is worth half a PC of equal level. If an Environ occupies multiple regions, it counts as half a PC of equal level per occupied region.