Then let's turn up the heat.

In the form of carefully placed black flames, of course.

The walls start dripping.

"We may wish to move to higher ground."

"Of course."

And they can make their way up, through a path that should melt later.

Waterbenders are beginning to converge on the palace, attempting to refreeze the ice.

She, of course, starts killing people.

And once the blood starts flowing, so does Eliana.

The waterbenders pull from the canals, lashing tendrils and forming new icy barriers.

(Her face is very hidden, by now, a blurred terrifying non-face.)

She laughs, and slams through their barriers, cutting them down and spreading her black fire.

The waterbenders start shouting about how the Faceless One is here, Koh come to destroy their city.

Well she's certainly not going to disabuse them of any such notions.

The city is, definitely, melting.

More and more the benders attempt to break off the fight and attend to repairing their city.

She'll let them evacuate, but she's not letting them fix this.

As this becomes apparent, citizens starting taking to boats, flooding out of the harbor even as it deepens.

She leaves a clone to monitor the palace specifically, to make sure the fire melts it in just the right way that it collapses dramatically, sending a wave of water through the canals.

The final crash is dreadfully loud.

"I wonder if those spirits will appreciate being rejoined with the ocean."

"I suppose we'll have to find out! I think I would, if I was a spirit of something as wild as the moon and ocean."

"Which would raise the question of why they allowed themselves to sit in that pool in the first place."

"Maybe we should follow them and ask."

"One hopes their speech can be heard above water. It is still frightfully cold for a swim."

She laughs a little. "I have chakra techniques to keep me warm, at least."

"Then I will let you do the talking, if events necessitate it."

"Perhaps we can get them to surface - but I'm sure you've noticed I do rather like to talk."

"Of course, the first obstacle will be finding them at all."

"My Rinnegan might be able to see them if I focus correctly - it interacts with souls, back home."

"Ah. Convenient."