Promethium longsword

The Promethium longsword is a sword used in the Dungeoneering skill. It is made of the metal Promethium, and at 94 Smithing it can be made using one bar. It requires 90 Attack to wield.

The only other way to obtain this item, without smithing it or obtaining it from other people, is to obtain it as a drop from forgotten warriors or from the boss "Blink".

As of now, it is the 2nd highest longsword available. As the primal longsword (requiring 99 Attack) was released on the 2nd November along with the Warped floors and the other Tier 11 armour.