Fungal bioluminescence, fireflies, glowtrees, a few fireflies in clearings and caverns, caverns well lit with fungal lights, bioluminescence is red.
Coastal fog, visibility 40 feet.
Clearings gone, moss on tree trunks and above the tree line and on more rocks than not, plants occasionally droop a bit, 33% extra plants for this level.
Storm, stray distant lightning, drizzles, hot winds.
Rivers are normal and there is morning dew, 33% more rain than usual for this level, one level down in river strength from normal.
Metal and rock unreliable, 67% decreased tensile strength for this level, ground can break (probably lethal).
If plants permit there is vine-thatching over smaller gashes, cavern entrances are fully crusted over, crust marginally easier to remove, vine-thatchings slightly brittle.
Lightning causes forest fires, fissures and lava fields, forest fires stop at rivers.
Vines can trap passerbys, 67% more powerful blood moon.