One of the greatest villains in comics' history, Darkseid has proven over the years just how deadly he can be. The lord of the planet Apokolips, Darkseid has been embroiled in war against the New Gods of New Genesis for ages but still finds time to smack around the heroes of the Earth, throwing them into dire situations that it takes all of their might to overcome.
Immensely powerful, there are few beings who can stand in Darkseid's way when he has a mind to fight them. The gods themselves quake in fear at the name Darkseid and rightly so- he can defeat them if he put his mind to it.
10 Can Beat: Uatu The Watcher
Uatu the Watcher spent his time on the Blue Area of the Moon, watching the human race. His race once meddled in the affair of another and caused its destruction, forever vowing to just watch. Uatu hasn't always kept that vow and has used his immense cosmic powers to help the Earth from time to time.
Uatu has proven to be powerful but he's not exactly known for his fighting prowess. Against someone like Darkseid, who has been fighting his entire life, it's doubtful Uatu would stand even the slightest chance. Even if he was a better fighter, Darkseid is much more powerful than him, with one blast of the Omega Effect enough to end Uatu's life.
9 Would Lose To: The Phoenix Force
The Phoenix Force is the embodiment of life, death, and rebirth. While it likes to seek out a host to guide it, it has also proven that it can be a powerful force on its own, with even the most powerful cosmic beings fearing a run in with it. Very few things can actually stop the Phoenix Force; it's enough just to survive its passing.
As powerful as Darkseid is, there's no way he'd be able to survive a confrontation with the Phoenix Force. He would probably try to take control of it and while a Dark Phoenix Darkseid is probably the scariest thing ever imagined, its destructive potential would prove too much for him to be able to harness, ending him and probably all of Apokolips in one fell swoop.
8 Can Beat: Ego The Living Planet
Ego the Living Planet is exactly what he sounds like- a living planet. Immensely powerful, it can completely control its surface and manifest minions to protect itself. It also has great telepathic power, able to communicate over wide distances and take control of most beings who can survive the onslaught of its attack on its surface.
Ego is powerful and Darkseid would send his Parademons to test it. Once none of them came back, he would decide on a different approach, Boom Tubing lava from Apokolips' fire pits onto its surface and its core, he would burn the living planet to a cinder inside and out.
7 Would Lose To: Mistress Death
Mistress Death is the embodiment of death in the Marvel Universe. Easily one of the most feared beings in the cosmos- unless one is talking about Thanos and Deadpool- Mistress Death is the inevitable end of everything. Even the most powerful gods fear Mistress Death- she comes for them all in the end.
Darkseid is known as the God of Evil but even would be unable to hold a candle to Mistress Death. Darkseid has proven that he can die, which means Mistress Death can end him. While he's always shown the capacity in the past to resurrect, there's good chance a battle with Mistress Death would be the end of him.
6 Can Beat: Thanos
One can argue that Thanos isn't technically a cosmic being but he's been able to defeat them in the past rather easily, even without the power of the Infinity Gauntlet, so he should count. One of the most feared beings in the cosmos, Thanos has proven that he's dangerous to anyone he battles, no matter their power level.
An age old question is who would win in a battle between Thanos and Darkseid and while it would be an amazing fight, Darkseid would take it. Thanos is powerful but Darkseid is more powerful and while Thanos is old and crafty, Darkseid has been around longer, battling against gods for centuries. A battle between the two would shake the heavens but Darkseid would win it.
5 Would Lose To: Galactus
The Devourer of Worlds, Galactus has cut a swath of destruction through the universe. Hailing from the previous universe, he was reborn in the crucible of the Big Bang, gaining immense cosmic power and a massive hunger, one that could only be sated by planets. Since then, Galactus has been responsible for the destruction of countless worlds and he's always looking for more.
Nothing Darkseid could throw at Galactus would do any good. He would finally have to battle the cosmic giant on his own but Galactus possesses the full fury of the Power Cosmic, which gives him amazing abilities. He would be able to absorb the power of the Omega Effect and without his greatest weapon, Darkseid and Apokolips would fall to Galactus.
4 Can Beat: Mephisto
A demonic ruler of his own dimension, Mephisto isn't exactly the devil but he does his best, trying to manipulate and tempt the purest souls in the Marvel Universe. He's also immensely powerful, even able to manipulate reality. Few have been able to overcome this wily demon over the years.
Mephisto would try his best to trick and co-opt Darkseid to no avail. When that didn't work, he'd lash out at the God of Evil, which would be a huge mistake for Mephisto- Darkseid doesn't take well to that sort of thing. As powerful as Mephisto is, he would fall to the wrath of Darkseid.
3 Would Lose To: Eternity
Eternity is an interesting entity- he is the universe. While he often takes a form, that form is just of fraction of everything. Eternity's power is pretty much in comprehensible- he has access to all of the energy in the known universe. The number of times he's been defeated can be counted on one hand.
While Darkseid definitely has the hubris to go up against an entity who represents the embodiment of the universe, there's no way he would be able to triumph. Eternity's power is just too great for words and there's pretty much nothing Darkseid could do that would even phase him.
2 Can Beat: A Celestial
The Celestials have been traveling the Marvel Universe for eons, experimenting with the lifeforms there. They are also very powerful, able to destroy a world with nary a thought. While they are actually energy beings, they encase themselves in nigh-impenetrable armor, making most attempts to hurt them futile at best.
As powerful as Celestials are, they aren't gods and that would their downfall against Darkseid. The Omega Effect would be able to crack their shell and Darkseid, who has had a lot of experience in these things, would be able to attack their essences, finding a way to destroy them once and for all or merely absorbing their cosmic energies for his own use.
1 Would Lose To: The Living Tribunal
The second most powerful being in the Marvel Universe, the Living Tribunal is the judge of all things, doing the bidding of The One Above All. He can shut down the Infinity Gauntlet with but a thought and there has never been a being that has been able to rival him. It's not so much that he's powerful but that he represents the ultimate power and no one can stand against his rulings.
The Living Tribunal can cow Eternity himself so Darkseid has next to no chance against him. It would barely be a fight- Darkseid would attack him and the Living Tribunal would say a few words and Darkseid would just disappear.