"Acapella" metal?

I stumbled across this on Spotify.. Kind of weird, the drums and main vocals are a bit loud, but hey. Still kind of neat IMO.

www.youtube.com/watch?v=fsVlfuWCRpw

I actually discovered them a few years ago when I was trying to get more into Nightwish. Ran into their cover of Wishmaster, which is pretty freakin awesome.

https://www.youtube.com/watch?v=XCGQiGEYl4Y

Actually, most of their covers are pretty awesome, but unfortunately, I never really gave their original works a chance.