Where to find the map in Mina the Hollower

In Mina the Hollower, players unlock the map by rescuing Rhene and Drillhardt.

After that, buy the map from Drillhardt in Ossex for 500 bones.

The map is found in the northwest corner of the Underlab.

Upgrading it adds collectible checklists and helps track unexplored areas across Tenebrous Isle.