Hephaestite

Hephaestite is obtained when Coal gets defiled. Hephaestite Ore drops several Hephaestite Shards which can be either used to light fires up (like fire charges) or as a fuel (burns as much as Coal). They can be crafted into torches, blocks, or Blazing Blastem Fruits.

Both Hephaestite Ore and Blocks emit light and will deal damage and set on fire whoever walks on it.

Umbrium

Umbrium is obtained when Iron is defiled. Umbrium Ore can be smelted into ingots which can then be used to make tools and several recipes.

Scarlite

Scarlite is obtained when Diamonds are defiled. They can be crafted into many powerful tools.