Primal maul

The primal maul is a members-only Dungeoneering weapon that can only be found in Daemonheim and is only dropped by Rammernaut on at least floor 18 or higher. It is the only primal weapon with a Strength level requirement, requiring a Strength level of 99 to wield. Additionally, it has the third highest crush bonus of any known weapon in the game (behind the sacred clay warhammer class 4 and 5) and currently maintains the highest strength bonus of any weapon. Like all primal weapons, this weapon lacks a special attack.

Being a primal weapon, it also cannot be used outside of the Dungeoneering skill, but has a similar counterpart; the chaotic maul, which can be purchased with 200,000 Dungeoneering tokens and 80 Dungeoneering. It has a slightly less strength bonus than a primal maul whilst being still stronger than a godsword and is usable throughout Gielinor.

Trivia
The attack speed and animation of the primal maul seem to be identical to that of the tzhaar-ket-om.