Seriously, yes, it is the title of the 1974 album by Deep Purple, the second of the so-called "Mark III" lineup, in which bassist Roger Glover and singer Ian Gillian had been replaced by Glenn Hughes and David Coverdale, respectively.
And my memory can't be that bad yet, because "Stormbringer" immediately had the name Elric pop up in my mind. As in Elric of Melniboné, the lead character in Michael Moorcock's 1965 novel titled "Stormbringer", after the name of Elric's
sword. I hesitate to call Elric the "hero"; while he's not a confirmed "antihero", he's certainly an ambivalent hero. I have an episode featuring Elric in some graphic novel stuff somewhere, and also a short story (or an excerpt of a longer one) in a compilation of stories collected by two German editors (so not just a translation of an English compilation) originally in 2005, and reprinted in 2012 as a paperback, titled (in my translation) "
Tolkien's Legacy". The original Elric story is from 1977, Moorcock's original title for it being "
Kings in Darkness (The Bane Of The Black Sword)".