Dungeon of the Mad Mage

Bringing the mummified hand of the dwarf king back, the party is able to open the doors to the Heart of the Mountain. Skella asks to be guarded while she attunes as ordered by Halaster. While doing so, a slaad who had been disguised as a duergar opens the door and lets a couple of invisible stalkers in, combat ensues. It takes a while, but eventually all enemies are either killed or ran away and the party just stands there barely standing. **game will be on Roll20**