The best metal for a Viking sword that offers durability and strength is high-carbon steel. This metal provides an excellent balance of hardness and flexibility, allowing the blade to hold a sharp edge while resisting breakage during impact. Historically, many Viking blades were pattern-welded using layered iron and steel for added toughness. Today, modern steels like 1060, 1095, and 5160 are popular choices for crafting strong, reliable Viking swords.