Betal

Drifter wasn't sure how he felt about this floor's mobs. They were cute, cuddly, and would try to murder you if given the chance. Their name was Thorn Nimbus, and they looked like slightly more solid clouds, just floating about ten meters over the ground. Until they aggroed on you, at which point the cloud reversed to show hundreds of thorns, or, as Silica propositioned, quills, like those of a porcupine.

Shattered: A SAO Tale (Sword Art Online)

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