Jewelled Idol Demiplane

Intro
This small demiplane hosted a shrine to Yan Turin. It was supposedly suspended or isolated in time, but it seemed more likely that it was in fact connected to the Elemental Plane of Earth.

It was found on the other side of a portal opened using the Jewelled Idol and the Dual Crystal Key, and was inhabited by the Shard Guardian, which the party defeated. The demiplane subsequently collapsed.

Description
The demiplane consisted of a single room approximately 60' in diameter. The architecture of this room resembled the caves of the Old Orc Encampment, as they would have been before the past centuries of ruin and decay.

There was ancient Orcish writing on the walls. Key words which Godric picked up while failing to get through the portal included: "Worship. Yan Turin. Silas. Abandonment. War."

Background
The orcish text on the walls of the room told the story of how the demiplane came to be:Godric recorded a full transcription of this text prior to the collapse of the demiplane. This record was shared with Shinan University.

"Thinking With Portals" (1x8)
The party entered the demiplane from The Sapphire Tower via a portal created by the Jewelled Idol and Dual Crystal Key. They defeated the Shard Guardian found within and mostly managed to escape before the portal closed - with the exception of Godric who was trapped on the demiplane.

"Fissures" (1x9)
Soon after the portal closed, the room began to rumble and shake. After around an hour, the ground began to crumble and a 10' hole opened up in the centre of the room. This hole descended more than 200' to a river of sand which Vangdondalor hypothesised was connected to the Elemental Plane of Earth. Over the next (approx.) 3 hours, this hole continued to widen until Godric and Vangdondalor were released from the demiplane by Su Miichan's Demiplane spell. At this point, there was only a narrow 5' band of floor remaining around the outside of the room.

It is presumed that the demiplane subsequently collapsed entirely.