The Tremor Mace is an iron mace and a royal weapon belonged to the Iron King of the Iron Dominion. It is one of many items featured within the Sonic the Hedgehog universe and it first appeared in the Sonic the Hedgehog comicbook series and its spin-offs published by Archie Comics. It has the power to shake the earth and it can match against very powerful weapons such as Monkey Khan's Atom-Bat and Amy Rose's Piko Piko Hammer.
The Tremor Mace has a red grip and a cylinder-formed head with flat spikes.
Although appearing to be magical in nature, it is possible the Tremor Mace is a technological weapon made by Dr. Ivo Robotnik, similar to the Atom-Bat. Seeing as the Iron King was not seen with it in his earlier years, it might have been part of the supplies provided by Robotnik Prime later on in his career.
It could possibly related to the Atomic Mace Ixis Naugus created before leaving for the Zone of Silence.
- The Iron Queen possesses a weapon of her own called the Iron Sceptre.