Great war mage colleges, secluded wizard’s towers, and alchemists’ workrooms are all examples of laboratories. Laboratories are places of research and typically include unique magical and alchemical effects that can’t be found anywhere else. In addition to living spaces, a laboratory requires workrooms and libraries.

Tiers. While laboratory inhabitants often include students and apprentices, the masters of large laboratories are commonly tier 3 or 4.

Under the earth lie twisting passages, vast caverns, and underground rivers, all cloaked in endless darkness. The environment itself can be just as dangerous as its inhabitants.

This generator lets you map a cave system. For Underland travel, see Underland Realm in Trials & Treasures.

Tiers. Tier 0 and 1 adventurers measure themselves against natural caves and caverns. Tier 2 and 3 adventurers delve deeper, into Underland itself.

Underland boasts many of the same vehicles that ply surface roads and seas. Shadow elf couriers use giant spider-drawn chariots, and galleys sail the Midnight Sea. Safe from inclement weather, airships fly through mammoth caverns and miles-long ravines.

A few vehicles are unique to the Underland. Aboleth-built submarines ferry treasure and thralls to underwater cities. Armed with torpedoes, aboleth submarines fight a never ending war against the fleets of sunless mariners.

Table: Underwater Vehicles