Cosmi-Rod

The Universal Weapon is a Kree war-hammer that is given to certain members of the Kree race.

History
Ronan's hammer was his main weapon. It was given to him on completion of a ritual performed by the Exolon Monks. Ronan then used it to kill a captured member 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 Infinity Stone in his hammer, using its power through the hammer. By doing so, he was able to destroy the Nova Corps' entire fleet. Drax destroyed the hammer with the Hadron Enforcer, enabling Star-Lord to get the Stone.

Capabilites
Built from advanced Kree technology, the Universal Weapon is an effective tool in battle. When merged with the Infinity Stone inside the Orb, it has also displayed various other attributes such as follow:
 * Concussive Blast: The Universal Weapon can fire a blast of concussive force that was strong enough to twist a person's head around 180 degrees.
 * Energy Projection: When combined with the Infinity Stone, the Universal Weapon is capable of discharging purple blasts of concentrated energy.
 * Planet Killer: When combined with the Infinity Stone, the Universal Weapon 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.

Trivia

 * In the non-canon video game Guardians of the Galaxy: The Universal Weapon, the Universal Weapon is revealed to be a powerful hammer made of Iso-8 which is capable of controlling the elements of the universe. Hence, the Kree Empire was thrown into a civil war over it. To end the conflict, the Kree overlord Supremor divided it into five pieces and hid them across the galaxy. The game revolves around Rhomann Dey sending the Guardians of the Galaxy to retrieve the pieces to prevent them from falling into the hands of Ronan the Accuser and his allies.