| Category | Islands |
| Location | Galathien |
| Climate | temperate |
| Map | Hadraniel |
Ronossilya is an island of Galathien. This island was created by the Thuregrid volcano in an era long since forgotten. The top of this dormant volcano is a massive storm titan citadel called Svirrurm. The cauldron of the volcano is a lake, which is encircled by the walls and towers of Svirrurm. The northern waters around the island have many hot springs feeding into them and geyser activity, so Thuregrid is still churning deep underground.