Diamond longsword is a powerful longsword that requires 65 Attack and 70 Slayer to wield. It is widely considered to be one of the best diamond weapons available, since it has two powerful types of attack styles. There two ways of obtaining the sword: either buying it from the Grand Exchange or receiving it as a rare drop from Metallic experiments. Many metal dragons have a strong weakness to diamond weapons as well as stab attack, giving even more uses of the Diamond longsword because of its high strength and stab attack bonus. It also comes with a special attack.