Magnamalo

"A monster with a carapace like tempered steel armor. The vapor around it is actually the expelling of trapped gases from the hordes of monsters Magnamalo has consumed. This has earned it the moniker "Wyvern of Malice." Its shrouded swings can inflict hellfireblight, which causes one to combust either spontaneously or when hit. Use a Deodorant or a Wirebug to rid yourself of hellfire."

Example of:
Hitodama Light