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Tempest Star Wolf (黒嵐星狼,tenpesutosutāurufu, lit. "Black Storm Star Wolf") is an evolved form of the Star Wolf with at least Rank A in power. This form is much larger than the previous evolutionary stages and has two horns on its head.
Ranga evolved into this form during the battle with the Orcs after observing Rimuru mimic it to deal with adventurers in Dwargon. This form is much stronger than an Orc General.