Giant Stairs

Multiple Biomes exist on this path.

Steel ladders and hooks on pitons.
Some delvers install their own as they trust themselves more than what's left behind.

On some of the stairs, their are booms hanging over the edge. But they are manned by dwarves that may have politics involved.

Gold blood caravan's use giant subterranean lizards, that climb the walls.

Lava
Huge temperature swings

#location