I haven't had a chance to submit something to @Kitty's #MittwochMetalMix yet. Time to rectify that. Back before #Blizzard went full evil (in public at least) I thought #MistOfPandaria was a pretty good #WoW expansion. Not great, but good. In it were a faction of insectoid creatures. Upon gaining enough rep, they let you choose one of several permanent buffs you could swap out at will - all named after metal songs.

I always used Battle Hymn. From the eponymous album: https://www.youtube.com/watch?v=pmuABimfKJs&list=PLBnJv6rImVe_oNG9aJEzvR55fFrrTH3x4