One Punch Man's Monster King appears from the depths of Z-City like a nightmare made flesh. Towering convoluted coils writhe with dragon heads that breathe molten destruction. Each horn hits through steel as easily as paper. This biomechanical horror rebels against every law of nature.
Orochi's power transcends conventional Dragon-level classification entirely in the One Punch Man series. His abilities include planetary energy absorption, instant martial arts mastery, and body transformation into countless serpentine entities. The Monster King can learn any fighting technique instantly, generate fire hot enough to melt stone, and draw energy directly from Earth's core.
Orochi's power originates from his unique origin story. Once a human martial arts prodigy who had already begun losing his humanity, he underwent a transformation process that turned him into the ideal of monstrous evolution. This metamorphosis bestowed him abilities that placed him in a league of his own among the creatures in One Punch Man.

The Monster Association's leader has physical capabilities that dwarf most beings in the series. His potency allows him to effortlessly defeat seasoned fighters and restrain powerful rivals like Garou with minimal effort. He could keep up with and overwhelm Garou with little effort, overpowering the half-monster Hero Hunter with relative ease.
His body can change into a squirming mass of dragon-like creatures, each capable of autonomous action and devastating attacks. This transition ability in One Punch Man lets him adapt to any combat situation immediately.
Orochi can generate fire and electricity, making him a formidable force in combat. His lightning attacks can engulf entire areas and shut down machinery with ease. Additionally, Orochi can breathe fire and launch projectiles, which are strong enough that they can melt stone.`
The Gaia Cannon and Fusion Powers of Orochi in One Punch Man

Orochi’s most dangerous power lies in his ability to tap into the Earth’s core, using its energy to enhance his devastating attacks. This technique, the Gaia Cannon, illustrates the pinnacle of his violent potential. By implanting his tail into the ground and soaking planetary energy, he can release attacks that cause global earthquakes and threaten entire continents.
When Orochi fused with Psykos, their merged form gained new heights of power that contested even the mighty Tatsumaki. The fusion continually grows stronger by absorbing the energy from others and the planet via tendrils rooted in the ground.
In the hierarchy of One Punch Man's most powerful beings, Orochi occupies a position near the very top. Orochi is mostly unrivaled on Earth. He was touted as the strongest monster by those who knew of his existence.

Maybe the most telling extent of Orochi's power comes from his meeting with Saitama. Understanding that Saitama's strength surpasses anything he's ever faced, Orochi is one of the few beings capable of realizing the hero's true power without underestimating him based on appearance.
Often seen as the Monster Association’s strongest member, Orochi was defeated by Saitama effortlessly. He also confirms just what a dominant force the manga's titular One-Punch Man is in his universe.
In the end, Orochi's power in One Punch Man portrays the ultimate indication of monstrous potential. His crossbreed of overwhelming physical strength, supernatural abilities, combat genius, and planetary-scale destructive capacity. He acts as a measure of what true power looks like in a world crammed with unique beings.