The Promethium warhammer is a Tier 10 warhammer found in Daemonheim, which is used in the Dungeoneering skill. The promethium warhammer can only be wielded by members who have a minimum Attack level of 90. Players can obtain the promethium warhammer with a Smithing level of 93 using 2 Promethium bars, yielding 185 smithing experience. It can also be obtained as a drop from Bal'lak the Pummeller, or level 178 skeletons with warhammers. Forgotten warriors can also drop a promethium warhammer, but only if they are visibly wielding it or its primal counterpart.
| Smithing level||93|
| Members only||Yes|
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|Bal'lak the Pummeller||91; 93; 96; 99; 102; 105; 107; 110; 113; 116; 119; 121; 124; 138||1||Random|