The Power Stone is one of the six Infinity Stones, the remnant of a singularity that predates the universe. The Power Stone is a powerful weapon capable of granting a person great, cosmic power, but is highly likely to kill any organic beings that touch it. It was used by Eson the Searcher until it was forgotten for millenia in the planet Morag inside the Orb. The Orb containing the Power Stone was coveted by Thanos, who employed the Kree warrior Ronan the Accuser to bring it to him. However, before Ronan obtained the Orb, it was stolen by Star-Lord on Morag, prompting a galaxy-wide hunt that resulted in the Orb being given to the Nova Corps for safe-keeping.
The Power Stone is a remnant of one of the six singularities which existed before the universe. After the universe came into existence, the Cosmic Entities used the energies of these singularities to forge six immensely powerful objects known as Infinity Stones. Hence its name, the Power Stone represented the destructive nature of the universe, and was incredibly powerful, capable of annihilating entire planets. The Power Stone was used by the Celestial bein Eson the Searcher to destroy planets and civilizations until it was forgotten inside the Orb for millenia.
It was later in possession of a group of Cosmic Beings who attempted to harness the power of the Stone by sharing its power between them, achieved this by linking themselves together. The effects were short-lived as the energy of the stone disintegrated all nine beings after a few moments. Eventually the Orb, and the stone inside it, were hidden on the planet Morag, storing it in a secret tomb that was hidden beneath the planet's vast ocean. The ocean would recede every 300 years, making the tomb accessible.
Once the Orb had been found by Star-Lord, he found himself on a mission with the Guardians of the Galaxy to sell it before Ronan the Accuser could find it and use it's power for evil. The Guardians took the Orb to the Collector where he used his technology to open the Orb while explaining the history of the Infinity Stones, marvelling at the Power Stone when it was finally revealed to him as he prepared to pay for it.
However the Collector's assistant Carina saw an opportunity to kill her master and attempted to grab the stone, only for it's power to violently rip through her body, destroying her entirely as well as much of the Collector's Museum. The Guardians attempted to escape with the Orb, only to be found by Ronan and his soldiers, as Nebula was able to defeat Gamora and took the stone into her own possession to return it to Ronan, much to the Guardians' horror.
Upon learning that the Orb contained the Power Stone,after aquiring it from the Guardians of the Galaxy, Ronan the Accuser questioned his need for Thanos' assistance in his quest for revenge. Ronan ripped the Orb and took the Stone from it consuming its energy, causing explosions all around him before he attached the Stone to his Cosmi-Rod in order to control its force, becoming more powerful than even the Mad Titan himself, who watched in silence at the betrayal.
- "Xandar, you stand accused. Your wretched peace treaty will not save you now. 'Tis the tinder on which you burn!"
- ―Ronan the Accuser
Unfazed by his enemies' attack on Xandar and filled with more power than all of them combined, Ronan the Accuser responded standing before the fleet of Nova Corps' Star Blasters and accusing them before sentencing them to destruction. He then used the Stone's power to fire a powerful blast from the Cosmi-Rod which destroyed the Nova Corps' entire fleet, as the burning remains of the army flew to the ground below and Ronan looked at the destruction with a sense of satisfaction watching the pain he was causing to his enemies.While to continued to watch the battle unfold, Ronan found himself confronted by the Guardians of the Galaxy after they subdued his bodyguards and shot Ronan in the chest with the Hadron Enforcer. Ronan then easily overpowered the group with a single shockwave blast from the Power Stone using his hammer.
Smiling to himself at the desperate and pathetic attempts to stop him that had been proved to be worthless, Ronan the Accuser mocked the Guardians of the Galaxy and prepared to unleash the Stone's power to annihilate Xandar. The moment before he could unleash the power, he became distracted by Star-Lord, who had challenged him to a dance-off. This distraction allowed Rocket enough time to repair the Hadron Enforcer allowing Drax the Destroyer to fire it at him, managing to destroy Ronan's Cosmi-Rod, disarming him and leaving the all powerful Power Stone flying in the air before him. In a desperate move to gain the advantage in the battle and kill each other, both Ronan and Peter Quill attempted to catch the Stone during the split second it hung unprotected in the air before them. Despite Ronan's best efforts to regain the powerful weapon, Quill was a moment faster and quickly caught the Stone.
The moment the Power Stone was touched by Peter Quill's hand, it unleashed a massive amount of energy, causing a shock-wave which threw Ronan backwards as flames engulfed the group. As Ronan watched on with a sense of delight, the Stone's incredible and almost uncontrollable power nearly killed Quill as his body was slowly ripped apart from the inside by the Stone. Ronan laughed as he watched Quill screaming in horrific pain.
However, Ronan witnessed Gamora, Drax the Destroyer, and Rocket Raccoon come together as a team and grab Quill's hand, helping with the burden of the Stone's power and gaining complete control over it. He looked on in horror and demanded to know how that was possible for a human to survive such power and Quill informed him it was because together they were a team, before directing the Stone's energy at Ronan, destroying his body and killing him.
After the defeat of Ronan, the stone was stored in the Nova Corps Headquarters vault. It remained peacefully untouched for three years until the events of Infinity War.
- Energy Projection: The Power Stone can be used to produce blasts, explosions, storms, orbs or tornados of lethal, purple, fire-like energy. When used at its maximum potential, it can produce an energy wave strong enough to consume an entire planet. Though the Stone seems incapable of performing this function inside a containment orb, instruments such as the Cosmi-Rod can be used to contain it, preventing the need to directly touch the stone and experience its deadly effects, and still exploit its full power. There has only been two known instances where living creatures have channeled the energy of the Orb. The first resulted in the death of all those who were present. The second was by the Guardians of the Galaxy, whose leader first grabbed it and was being killed by it before the others grabbed his hands and each others to share the energy and their leader released some of the energy to kill Ronan the Accuser. When the energy touched living things, it corroded and burned them by first coursing through and then causing them to burn and disintegrate until they are reduced to purple ambers that then fade. The process of being destroyed by the Stone's power is seemingly extremely painful.
- Enhanced Durablity: Similarly to Malekith while he was wielding the Aether, Ronan's durability was enhanced while bearing his Power Stone-infused Cosmi-Rod. He withstood a direct, close range shot from the Hadron Enforcer, with no apparent injury as well as not being at all affected by the crashing of the Dark Aster as he walked away from the massive wreckage of his ship as if he had landed without problems.
- Enhanced Strength: The Power Stone also increased Ronan's strength.
- In the comics, the red colored Power Gem gives the owner access to all power and energy that ever has or will exist, and can back the other gems and boost their effects. Its most basic powers grant its user unlimited stamina and can increase the user's strength to unlimited levels depending on how much the gem is drawn upon. It allows the user to duplicate practically any physical superhuman ability and become invincible. It was used by the Champion of the Universe, Thanos, Nebula, Adam Warlock, Drax the Destroyer, Thor, Magus, Rune, Lord Pumpkin, Loki, Galactus, She-Hulk, Titania, Mister Fantastic, Odeni, Hood, Red Hulk, Xiambor and Namor.
- Eson the Searcher, Guardians of the Galaxy and Ronan the Accuser are the only beings to have succesfully used the Power Stone thus far.
- Out of the five Infinity Stones that have been seen in the MCU thus far, the Power Stone is the only one that has not yet visited Earth.