Well, the flavor text says he has six arms that can grow from his back, but I guess that does make eight total. It's kind of hard to say which one it's supposed to be without knowing a lot more of the backstory. I strongly suspect he's supposed to resemble a DnD
Marilith.
That said, I know this isn't really a translation issue but both Gaieshart and Alvein's attack actions have a lower case a in front.