silly islands that float above the fog
Mildly acidic and mildly impish, these creatures are a relatively common sight in the sky islands. Individual fiends are just barely sapient and rather clumsy, while 'hives' of blood fiends are mostly-fully functional people you can hold a conversation with.
The three main parts of a blood fiend are its eye, its boiling acidic 'blood', and the highly insulative membrane keeping them together.
A hive of blood fiends who are just really into blacksmithing. Her interest was ignited when they found a nearly pristine anvil in the middle of nowhere. Yay.