Let’s compile a list of environmental damage sources!
Underkeep
- Black blood containers do enough damage to oneshot the next container in the line and any other mobs in it
- The 3 ‘bosses’ running around do massive damage to mobs and even each other
Nightfall Sanctum
- Bombardment from touching shadow tripwires damages everything except Brann
Skittering Breach
- Shadow bombardment again
Earthcrawl Mines
- Mine carts hit and stun everything, including Brann. Unlike the Underkeep pain train, mobs can only be killed while in combat.
But spores are apparently too useful, despite being more dangerous to trigger because you have to remain in range until the last second.