User blog comment:B214/Talk About What You Want! 3/@comment-3965848-20150419120339/@comment-1359322-20150419125556

It's irregular probably because it fused 2 impossible attributes together. Look at the 2 Blade Blacksmith BB. While both are different, they are still limited to Holy Swords, while the Sword Birth isn't.

And no the Triana and CCQ aren't irregular because it's not related to the Boosted Gear, it's related to the Evil Pieces, without the Evil Pieces, all forms are unattainable.