| Category | Marvels |
| Continent | Brucrumus |
| Region | Hells Womb |
| Location | Agulbandal |
| Owner | Surticon |
| Built | 11 Saunas 114 GE |
A relic of the Demon Spawn War (89 GE - 269 GE), Yorthrun Tor is a network of canals and fortifications stretching from the slopes of the Daughters of Surtur to a great lava lake. Consisting of lava spillways, canals, sluice gates, towers and castles, it is a heavily fortified area where the surrounding lands can be bathed in the fires of two volcanoes. Built by forces under Surtur, a reluctant Covenant ally, Yorthrun Tor proved instrumental in slowing Demogorgon's advance north into Sector Inirthak.
Constructed of lava stone, concrete and Naanabrak, the latter making many parts impervious to magic, and with canal walls a hundred-feet thick, and walls and towers suitable for the footfalls of a fire giant army, Yorthrun Tor became an important Covenant bulwark in the fight against Demogorgon's seemingly endless numbers.