Marked on a map, an abandoned copper mine on the way from Cherkessia to Oleshie?. This mine had two magma golem? guards, and various points on the walls appeared to have been ravaged by a xorn?. Deep in the mine was a chasm with an unnaturally smooth floor, which was resistant to the stone shape spell.

• The chasm floor was protected by a permanent antimagic field effect
• Tunneling through it revealed a permanent passage to another plane, which turned out to be Muspelheim?
• There was a dungeon there, guarded by a bound efreeti?, whom the PCs killed
• The dungeon turned out to belong to Vladislav Chernovsky?, and contained many of his servitor creatures (led by a Huge stone golem?), who gathered to confront the PCs
• The PCs departed when they realized this, contacted V. Chernovsky? to inform him of their accidental trespass, who responded that he bore no grudge but that they must never speak of the place to anyone