Fields
Fields are effects that can exist on tiles (such as fire, smoke, etc) which might affect items and creatures present there or stepping on it (including the player). All monsters able to dig are immune to fields.
All fields dissipate when their density is equal or below zero.
Aesthetic
These fields don't have any significant gameplay effects.
Emitters
These special tiles serve as sources for other fields to emit from.
Some Artifacts can also emit fields, as can some artifact spawn locations, also called anomalies. There are also monsters that can create fields, for example, the Shocker zombies shooting electricity.
Environmental Hazards
These fields can inflict undesirable status conditions on players and mobs that stand in or move through them.
Other
- Push items - This field is only created around a rare artifact anomaly spawn location. As the artifacts are already rare, this field itself is also rare.