In B-st form, Haseo wields dual Broadswords, as well as its claws. It possesses immense power and speed, but reduces Haseo's intellect to that of a snarling beast unable to focus on anything save for the target of his rage. In his mind, Haseo is chained to a flaming rock above what looks like a hellish inferno. Though Haseo confronted Ovan in this form, it proved vastly inferior to Ovan's unsealed mode. With the aid of Atoli, however, Haseo was able to convert this rather useless form into his proper third form, and from there into the orders of magnitude superior Xth Form.