The hammer was Ronan's main weapon. Ronan used it primarily to execute captured members of the Nova Corps.
When summoned to the Sanctuary by Thanos, Ronan was warned by The Other to show the Mad Titan courtesy. Annoyed by the vizier's ranting, Ronan killed him with the hammer, twisting his head 180 degrees.
Once he obtained the Orb, Ronan put the Power Stone in his hammer, enabling him to use its power. By doing so, he was able to destroy the Nova Corps' entire fleet. Drax the Destroyer destroyed the hammer with the Hadron Enforcer, enabling Star-Lord to get the Stone.
Built from advanced Kree technology, the Cosmi-Rod is an effective tool in battle.
- Concussive Blast: The Cosmi-Rod can fire a blast of concussive force that was strong enough to twist a person's head around 180 degrees and to send small groups of people flying several meters.
When merged with the Power Stone, it has also displayed various other attributes such as:
- Energy Projection: When combined with the Infinity Stone, the Cosmi-Rod is capable of discharging purple blasts of concentrated energy.
- Planet Killer: When combined with the Infinity Stone, the Cosmi-Rod had the potential to obliterate an entire planet, but the stone was wrenched from the hammer before Ronan was ever given a chance to do this.
- In the comics the Cosmi-Rod, or Universal Weapon, is the regular weapon given to the member of the Accuser Corps of the Kree Empire.