Iocalfaeus Gas [Iodine (purple-colored), Calefacio (to warm, melt)] is a light-sensitive gas that will radiate at extreme temperatures when exposed to too much light.

When exposed to light, entities near the gas will be significantly slowed. Stone surrounding the gas will also be warmed, and can be warmed to the point where it melts to lava. Lava will generate enough light to cause a rapid chain reaction, effectively turning an ordinary cave into a molten mess.

Gas Pockets containing Iocalfaeus Gas are lined with Diabaline Ore.