The the Celestials. While these entities serve as the driving forces behind many cosmic happenings, even they pale in comparison to a certain extradimensional threat.
2000's Avengers: Infinity by Roger Stern, Sean Chen, and Scott Hanna sees the Avengers face a race of androids who break down planetary matter so that their master can reshape planets. When the master arrives, the Avengers are taken aback by how massive the being is, and how efficient it is in breaking down the planet, to the point Galactus is but a speck in comparison." The hero Photon its that it's a cosmic entity like no other, but Thor believes that they can still best it, having beaten Galactus and some of the Celestials before.
However, the heroes were not ready for the arrival of more of these supermassive beings, only to find out that they are not the enemy, but just the servants of the actual threat, the multiversal Infinites. The Infinites exist between realities and have dedicated themselves to rearranging universes to allow for better energy flow throughout the multiverse. Their plan involves using reformed planets to create a portal that the Infinites can reach through and shift the universe's position - an act that would exterminate life on all the planets involved. The Avengers summon Eternity, the embodiment of creation, to combat the Infinites, but even Eternity is unable to prevail against them.
So, how do the Avengers manage to defeat the multiversal beings? Galactus is an irrelevant crumb compared to them, and if Eternity could not do it, then certainly nothing else in the universe could either. Thankfully, the Avengers realized that there are other means of besting their enemies aside from hitting them with as much power as possible. By taking a page out of Masashi Kishimoto's, the creator of the critically acclaimed Naruto and Boruto manga series, playbook, the Avengers utilize the author's most powerful technique: Naruto's "Talk no Jutsu." The Avengers manage to dissuade the Infinites from going through with their plan by showing them the vastness and variety of life on the planets that they would be destroying. Usually, this would be too insignificant for them to see on their own, but after it is brought to their attention, the Infinites decide not to shift the universe.
Marvel made the Infinites so powerful that it's almost incomprehensible, and not even Galactus, the Celestials, or Eternity could compare to them. But it turns out that one doesn't always have to punch through massive problems like Galactus and the Celestials, especially when talking through them can be a better and more effective method.
