WhoKnowscs: Rune Is a third person melee game. If you can remember the game Heavy Metal F.a.k.k. 2 , it plays quite similar to that except without guns, or if another idea is needed think of the lightsaber battles in jedi outcast/jedi academy. Its main focus was single player and while the story had a good setup the pacing hasn't always seemed right to me(although I would still like to get to the end eventually).
As for multiplayer, don't even bother unless you have Halls of Valhalla(or the gold edition). There is a fan made patch out that brings the game up to 1.08(and its even promoted-if not necessarily supported- on www.runegame.com. The patch is only compatible with a version with HOV(either separately or together as rune gold). Also I just checked(while writing this post) and there were about 50 mp servers. A couple of years ago when I was only using the base game(no XP) there were like 6 servers only 1 of which would have people. I couldn't tell if the servers I just pinged required HOV at first glance but a couple of years ago nearly all required it.
Sadly, at least for GOG, a couple of months back I finally bought the gold edition(I had the regular game for years) on Ebay for like 15 dollars as I got tired of waiting so even if it did show up on GOG I wouldn't buy it except for a really good sell(as a sort of backup).
Note: Halls of Valhalla the expansion is multiplayer only. It adds no single player content.
Here's a video:
http://www.youtube.com/watch?v=KZJICkhzG28 If you are interested in making the game look about as good as it can be you can get an great updated OpenGL renderer here:
http://www.cwdohnal.com/utglr/ - version 1.5 if you look down passed the older ones. Although you will need to do some .ini tweaking as it adds a bunch of new settings:
http://www.cwdohnal.com/utglr/settings.html I liked Heavy Metal, not just for the obvious reasons lol, but it was a good game :)