Meeting Janet van Dyne The Council of Kangs, having deemed Kang too dangerous, chose to banish him into the Quantum Realm in an attempt to prevent a new war, since Kang was still seeking to conquer the Multiverse.
Summary. Kang's death in Quantumania was not caused by ants, but rather by a series of events that weakened him and allowed the ants to overpower him. Kang's death may have actually benefited the MCU, as Jonathan Majors' personal issues led to his firing from Marvel.
In his last opportunity to escape, he had a brutal duel against Ant-Man, which resulted in Kang being shrunken and decimated by his own Engine Core, though his death inadvertently alerted the Council of Kangs about people interacting with the Multiverse, prompting them to take their own measures.
QUANTUMANIA: Why Kang Was Exiled & Kang War Explained!
Which avenger does Kang fear?
However, their adventure gave Kang the insight he needed to determine that Conan was far too dangerous to be left alive, not to mention the impetus to take action against the perceived threat at hand.
Kang isn't physically stronger than Thanos, and if the two were to square up in a one-vs-one fight then the Titan would arguably win. However, Kang's knowledge of the multiverse means that would quite literally be several steps ahead of Thanos at all times. As a result, Kang wins this battle.
The Time-Eater ranks atop the most powerful Kang variants thanks to his assuming Galactus' power. This variant killed Galactus and absorbed the Power Cosmic.
Based on Ant-Man and the Wasp: Quantumania alone, it certainly seems as though He Who Remains was the more powerful and capable variant, having succeeded where the exiled Kang epically failed.
Disabling his suit could potentially strip him of his technological powers and weaken him. Ant-Man has already shown the ability to sabotage technologically-advanced suits like he did with Falcon and Iron Man in previous movies. This could be a key advantage in defeating Kang.
Janet believes him until she touches the Time Crystal in the temporal gateway core she repaired and she's flooded with visions of Kang's countless genocides. Upon finding this out, Janet sabotages the machine, causing Kang to be stuck in the Quantum Realm with a maniacal desperation to escape.
Kang is his own worst enemy, constantly trying to prevent the future or undo the past. By doing so, he inadvertently creates variants of himself who sometimes hinder his world-conquering goals. Such variants include Immortus, Rama-Tut, Iron Lad, Victor Timely, Baby Kang, and the Council of Kangs.
He also ensures that some of the technology Kang will need gets invented (Tony's time travel machine). As he gamed this particular fight over and over, maybe more than 15 million times, He Who Remains chose this specific set of events. He caused Heimdall, Loki, Gamora, Black Widow, and Iron Man to die.
Kang was a villain that surpassed the rules of time and space and was a conqueror of all worlds thanks to his advanced technology. For Kang, his mission was to visit many points in time and conquer them in hopes of amassing an army built over ages to take over the world.
As a time traveler from the 31st century, Kang has access to technology and weaponry far beyond anything that 21st century Earth is capable of producing. With the resources at his disposal, Kang possesses mastery over time and space, as well as the power to battle armies single-handedly.
Prior to his appearance in Quantumania, though, Majors made his MCU debut in the Season 1 finale of Loki, playing one (of many) variants of his villain Kang the Conqueror named He Who Remains.
Why Kang would beat Thanos. Kang isn't physically stronger than Thanos, and if the two were to square up in a one-vs-one fight then the Titan would arguably win. However, Kang's knowledge of the multiverse means that would quite literally be several steps ahead of Thanos at all times. As a result, Kang wins this battle ...
Even though the 616-universe's variant of Thor might harbor enough power to take on Kang the Conqueror by himself, Hemsworth's comments about potentially retiring the role suggest that Kang would, in fact, overpower the Asgardian.
Given the involvement of time-travel, Thanos and Eros recruit the help of Kang, and Thanos ensures that he's put in his place immediately. The Mad Titan makes it abundantly clear that Kang is to refer to him as 'Lord Thanos', and Kang obeys.
Kang is stronger then Galactus! Kang is a threat for the entire multiverse (so also What If...?, Raimi and Webb trilogies, Fox X-Men Universe), has millions of Variants + the entire TVA can travel through the multiverse and through time!
So, Loki is right to be afraid of him because this variant is clearly trying to hide in plain sight. Whatever the Council of Kangs is planning could be coming through him as he could be the new leader of the TVA. Following his trail, Loki must have reached the city of Timely, Wisconsin.
It was a brilliant ending in which killing Kang is not the answer, in fact not killing him is one of the only paths forward, but Loki forges a new solution, holding the entire multiverse together as the new God of Stories nestled in a cosmic Yggdrasil world tree.
