Echoes in the Depths
It’s dark and spooky. It’s also unnaturally huge. The Underdark is many things. It has as many secrets as the above world, but they’re hidden in the darkness. During their first foray, the party encountered a Drow invasion tunnel from a past war, Drow ruins, a huge spiral staircase that gave the party the heebiejeebies, shadowy bridges, eyeless mutated Drow and an entire Dwarven city lost in the stone.