Malekith

Thor had no idea who Dormammu was, so Odin had to explain:

"The ruler of the Dark Dimension. A being of pure magic, found in the oldest legends.

If your friend could defeat even one avatar of such a being, it means he has already crossed the threshold into the Skyfather level."

Skyfather-level???

Thor stared in dumbfounded disbelief.

Odin studied Chu Hang for a long time before finally giving a slow nod.

"Very well."

Those two words meant that the king of Asgard had agreed to this enormous gamble.

"The plan is simple." Chu Hang held up two fingers. "First, lure Malekith out. Second, let him extract the Aether from Jane himself."

"What?" Thor was the first to jump up. "That would be handing him his weapon! Besides, forcibly extracting it will kill Jane!"

"Calm down, Your Highness." Chu Hang glanced at him as though looking at an idiot. "Who said anything about forcibly extracting it? I said we should work with what it wants. Think of the Aether as a tenant, and Jane as the house. If we try to evict the tenant, it'll tear down the house along with it. But if its old friend—Malekith—calls from outside and tells it to come home, it'll want to leave on its own."

He turned to Odin and continued, "When Malekith starts extracting the Aether, its connection to Jane will temporarily weaken, shifting from fusion to transfer. That's when I'll act. I'll be like a knife, slicing between them and severing the connection completely. At the same time, I'll stabilize Jane's vital signs to keep her from collapsing. Then I'll intercept the Aether before it fully enters Malekith's body."

"The risk is considerable," Odin said. "How can you guarantee that you can control the Aether in its complete form?"

"I can't."