Halls of the Mountain King was the second 4th Edition Open Design project from Kobold Press. I ran the adventure in 2010 as part of the same Parsantium campaign as Wrath of the River King.
Here’s the write up from the 14th session in which the PCs battled devils and cultists of Mammon . I was disappointed no one tried to use one of the giant water wheels to get on the ledge or swing on any of the chains. Oh well!
Begin here with Session 1 – Alarm in the Dead of Night.
19th Quintilis (contd.)
Realising they need to get up to the altar-forge of Korak to sacrifice the Teardrop of Grajava, Saethus decides to open an arcane gate to a spot right next to it. Unfortunately, he is bound by the fiery gold chains of the kyton nearest to him, rooting him to the spot. The eladrin still manages to get the gate open but the characters are held in place by the bludgeoning shadowy tentacles conjured by Tarisaul Eris, a cultist of Mammon. Khuma escapes the tentacles and dives through the arcane gate, appearing next to the altar. The shifter smashes the Teardrop on the forge and it shatters in a rapidly expanding sphere of cerulean light. Tanya Hrovitz, priestess of Mammon, and her diabolic allies are not amused, and immediately set upon the shaman who is alone on the ledge.
Brave Ella is next through the gate but ends up in trouble as the Mammonites’ attention switches to her. Tanya’s infernal greedfire blinds the elf ranger and Khuma, and to make things worse, Ella is also bound by a kyton’s chains. Krivinn comes to her rescue, using hero’s poise, and the ranger makes her first death save. Bolval who has been slow to react finally steps through the gate and Ella is healed.

Poor Saethus is now on his own on the lower level, facing a kyton and a hamatula. He’s caught in the kyton’s fiery chains several times but eventually manages to dispose of the devil using thunderwave. Meanwhile, up on the ledge, Ella splits the tree to kill Tanya and a hamatula. The last hamatula dies to Krivinn’s divine sanction when it attacks Bolval, and Eris is killed as he makes for the door to the Great Stair.
The battle over, the adventurers loot the bodies, finding a +3 amulet of double fortune on Tanya and a +3 robe of avoidance. The party enter the secret chapter house to report to Most Silent Master Caradlather. Their actions have purged the unmined orichalcum of Mammon’s curse and cured anyone with gold fever. As a reward, each character gains Korak’s Boon (a permanent increase to one ability score).
Caradlather also gives Ella a map showing how to reach the Library of Thorvir Runeshadow via the Endless Stairs. There the ranger hopes to confront the evil Heinsoo!
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