I did not know there was such a thing as "melodic death metal", but apparently Cadacross was such a thing. It was a Finnish band formed in 1997, but doesn't seem to have been around for at least a decade. What has drawn my attention to it is that they had an album called
Corona Borealis. Lyrics by Sami Aarnio are on the apocalyptic side. I guess that's the death part. The melodic part isn't so obvious to this old fuddy duddy.