Dark Souls and or Demon's Souls? I can't find anyone else who has played this game =3=
It is for PS3 and Xbox 360. Demon's Souls however, is only for the PS3.
Dark Souls

And Demon's Souls is the prequel.
Demon's Souls

If you love a good challenge and don't mind rage quitting a few times, I seriously recommend this game. It is soo much fun. This is one of the only recent games that has impressed me so much, because let's admit it. Almost every video game today is a shooter that lacks any kind of originality. Don't get me wrong, even I think Call of Duty is fun every now and again, but games like this don't get enough attention. Give it a shot! :)

Here is a little video of one of the earliest bosses in the game.
*NOTE: It might be disturbing to some.