Charred Skeleton

Charred Skeletons, similar to Armors, are one of the more basic undead creatures. These, however, are a bit more rare than Armors. For starters, these creatures mainly only live in places like Ante Deloe and the Fire Kingdom, with their prevalent volcanoes, not to mention World's End. However, those are merely the places that are the most common. They can also be found anywhere that someone has died a death due to fire, explaining their appearance and lack of flesh.

These creatures are immune to fire, and even lava, so shoving one into the pool of lava you found beside it won't do much. They can be dispatched easily, however, by hitting it enough with any tool, even weapons enchanted to be fire-weapons, as long as the physical force gets delivered. 
Taking a closer look, a strange, tough fleshy substance dubbed as 'Pyrocarn' can be found on the larger joints, such as vertebrae and limb joints. This can be harvested and used for potionbrewing, medical treatments, and enchanting, and even a few rituals. 
These creatures behave in a way similar to Armors, except without any aversion to light. One must kill them in order to stop them from killing you in your sleep, out near the Fire Kingdom or Ante-Deloe.

Scientific Name

Mortis Pyromort