This is the Berserker’s Armor, an ancient and cursed suit of armor that increases the wearer’s physical and mental capabilities increasing his fighting strength for a price: the armor damages its wearer’s body and allows the wearer’s inner beast to take over and attack everyone in the area, may they be friend or foe.

I had no idea who or what this was, but my office mate saw this image and told me all about it. Apparently, when Guts takes off the armor, he’s filled with scars from the armor’s attempt to “eat” the user and physically damage him, which I really find… disturbing.