I don't see Finntroll mentioned on here too often, so I thought I'd share this Finnish gem of a band. Ballsy metal, folk music and something the Finns call "Humppa"
https://en.wikipedia.org/wiki/Humppa combined into a quite unique sound. The lyrics are in Swedish and are usually about trolls hunting for christians and stuff. Scandinavian folklore.
They started out in 1997, so they've been doing this for a while. Their latest album is called "Blodsvept" and was released earlier this year. I've played it so much I start to know it by heart now; absolutely love it!
If you don't take music too seriously and tolerate harsh vocals, I suggest you give it a shot. And call your friends and have a troll party, the music deserves it.
Two songs for starters:
Skogsdotter ("Forest daughter") off their latest album "Blodsvept"
En mäktig här ("A mighty army") from "Ur Jordens Djup"