Dark blade

The dark blade is a very powerful weapon obtained after the quest Battle for Gielinor. During the Darkness Saga, the sword is wielded by Lord Darthon. Once you have defeated Darthon (level 289) he will drop his blade which you can take as a reward.

The dark blade is similar to the Korasi's sword. While Korasi's sword's normal attacks deal more damage and are more accurate, the dark blade's has a more useful special attack: a paralyzing, powerful magic attack that can go through prayer.

If you give the dark blade to Lord Viligad, he will offer you 10,000,000 coins, but you will not be able to get another one unless you buy it back for 15,000,000 coins.