The battle scenes were good, and Eirk is maniacal and quite interesting. Gore is fine by me, as well

I have one piece of criticism: There are tons of different characters and perspective switching, it's tough to keep track of them all, especially with the names. And I don't know what any of these characters look like, either.
In the first ~800 words you introduced 6 characters, which isn't too bad, but I don't know anything about them or what they look like, which can be bad.
I can tell the scenes are supposed to be fast paced, so reserving a line/paragraph describing what a character looks like would take away from it, but here's a suggestion:
Original sentence: "He rolled out of bed and tore his sword and armor off the wall."
Revised to show description: "He rolled out of bed, flipped his long black hair out of his face, and tore his sword and armor off the wall."
(I have no idea if he has long black hair)
Something like that.
Overall, this is good. The characters just seem very shallow right now.