The Bloodbones is an enemy from Final Fantasy IV -Interlude-. Bloodbones tend to attack in packs. They are capable of casting Thunder and possess a weak physical attack. Being an Undead enemy, spells that normally heal will damage Bloodbones, therefore Rosa can group-cast Curaga to defeat all of them at once.
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Etymology
In Western folklore, Bloody Bones is a bogeyman figure feared by children and is sometimes called Rawhead, Tommy Rawhead, or Rawhead-and-Bloody-Bones (with or without the hyphens).