The Frozen Fortress

It appears in the alternative timeline The Age of Winter.

History
The Traveler returns to the Divine era to find a distressed Isfarger. She informs them that Heorot has devastated the southern desert land and he has grown cold-hearted, while Grael uses his mustered army to march against Thetima and imprisons anyone not consorting him. She begs the Traveler to free the Heoborean held captive in the Fortress.

The Traveler manages to fight through some opposition and finds the imprisoned Heoboreans at a pier. They defeat Icebriar the Jailor and the cage is set open. A civilian tells that their leader, Yulia has been taken to the other part of the canyon, sealed in a block of ice.

Eventually, the cocoon is found and shattered, and Yulia is set free. She tells that Grael became vigilant with his efforts and tries to nullify Thetima and Solarum, now that Maj'elka is destroyed. She remarks however that Heorot tries to defend his kin and he preemptively wages war on the other deities. Using this, she tries to go east and reason with Heorot, while the Traveler is told to go west and reason with Grael.