Goblin Fort
Spoiler Warning: This page contains spoilers which may affect your IVAN experience negatively
"You see here an overgrown ruins of an ancient fortress."
This location will only appear on your map after you speak to Lord Mittrars in the Castle of Aslona. The layout is similar to other dungeon levels with a couple of notable exceptions:
Salt Cave
Goblin Hideout
The last level, it contains a room with a large number of goblins including a goblin prince on a golden throne; a jail room with a neutral goblin, a castle guard and Artorius the kidnapped prince; and a storage room with a lot of treasure, but also two goblin warlocks.
The jailed guard must charmed like any other NPC, but the prince can be 'tamed' simply by chatting with him. You will somehow need to get the price out of here safely to finish Lord Mittrars' quest.