The Frost King's Realm
The Frost King's Realm was the home realm of the version of the Frost King who associated with Madame Tarsa and the Frost King. The Frost King was specifically based in the mountains of Manik, a snowy land whose very ground was made of ice underneath the snow. (PROSE: The Frost King's Treasure, The Winter Quests)
In 2019, Darius crashed Doctor Curious's Void Ship in Manik and decided to lure a number of his enemies there with promises of the Frost King's treasure in an attempt to get revenge on all of them. He failed, however, with Madame Tarsa banishing him to a random dimension and the treasure-seekers (who also included Copper-Colored Cupids, Wellsians, Retconning Crocodiles, a member of the Order of the Automata, and parts of the Interdimensional Tavern's waitstaff) dividing the treasure they actually found between themselves. (PROSE: The Frost King's Treasure)
In 2021, CS-NA, Century Smith and Briar found themselves in the Realm was it was invaded by the Mecharons, and managed to defeat them. (PROSE: The Winter Quests)