The Berserker Armor is a suit of highly durable body armor currently worn by Guts. Wearers of the armor are aptly named "berserkers", due to the superhuman strength and inhuman ferocity they are bestowed.
At an unknown point in time, the Berserker Armor was forged by the dwarf blacksmith Hanarr, who imbued it with an ominous od that aligns with its wearer, who is driven by violent emotions and forgets about pain and fear. The armor was eventually donned by the man who became the Skull Knight, used by him to combat demonkind. Eventually, he entrusted the dangerous artifact to his friend, the witch Flora. In her care, it remained locked away.
It is later entrusted to Guts after Flora's spirit tree mansion is invaded by apostles of Griffithe's reborn Band of the Falcon. In spite of Grunbeld's immense strength, Guts easily withstands his attacks after donning the Berserker Armor and overwhelms the apostle in their clash, forcing him to admit defeat as a warrior and transform.