Environmental effect
In Arknights, there are certain environmental effects which act as hazards to friendly units although some affect enemies as well. All of them share a common trait of dealing damage, though not all damage-dealing operation mechanics and terrain effects can be considered as environmental damage, with five of the following being treated as such:
High Tide is not considered an environmental effect as it does not directly damage friendly units; Nethersea Brand is also not considered an environmental effect either, despite its damage-over-time mechanic.
The only interaction with environmental effects is Folinic's talent Drug Inhibition Technique, which reduces the damage from environmental effects she took by 40%; when her PHY-Y Operator Module is upgraded, it also benefits other friendly units, albeit with a reduced effect of 15% at Stage 2 and 25% for Stage 3.