| Category | Volcanoes | ||
| Continent | Karterus | ||
| Region | Azrik, Maleddanar | ||
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In the surface realm, Trelshum is one of the two southernmost volcanoes of Azrik. Conversely, within the Underdark, it lies in the southern extremes of Maleddanar.
In the Dawn Era and during the Creation War (1486 DE - 8777 DE), the fire titans known as "Path Breakers" opened the Geingil Spigot into the Fangath sector. They did so under the directives of Surtur, with the objective of establishing lava avenues to the surface; under suitable circumstances, this method occasionally succeeded, with pressure and lava breaking through to the surface and resulting in a volcano.
The molten river that ascended Geingil Spigot led to the formation of three volcanoes - Grielfand, Thrammaer, and Trelshum - along with a network of lava tubes connecting them. The primary lava artery for these regions is Ofli Hrolmir, which is merely a tributary of Surtur's Artery.
In the Lith-Crillion Era, Fire Giant colonists ventured up the Geingil Spigot. They established settlements near Trelshum and the region's other volcanoes. The descendants of these fire giant pioneers subsequently constructed places like Megrlof and spearheaded the charge to seize Goth-Dyvermoir during the Second Epoch.
On the surface, Trelshum's cone is among the southern peaks of the Siganbul mountain range. During the latter stages of the Lith-Crillion Era, after the Auhtai had created the Hive Swarms, those passages near the surface were sealed off. This has largely shielded Maleddanar from the bug attacks that have ravaged the lands of Azrik and Gulimbor.