The promethium knife is an item that can only be obtained and used while training Dungeoneering. It may be obtained as a monster drop, or produced using the Smithing skill.
Off-hand promethium knife ×10
| Smithing level||94|
| Members only||Yes|
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|Necrolord||98; 100; 103; 106; 109; 112; 114; 117; 120; 123; 126; 128; 131; 134; 138||125||Random|