Fine, fine. She goes back to putting holes in him in various ways and healing on an alternating basis, occasionally breaking it up by forcing back rain and waves.
It's less like an ordinary wave than a roaring wall of water, as if the sea had decided that it is going to be over here now. Defenders who can't protect themselves crowd around anyone who can protect them, with time being the limitation rather than who was trying to kill whom last week. Not everyone can make it to safety, and of course the monster himself tries to interfere with the more successful efforts.
Kithabel doesn't think she can speed up everybody, but she makes a guess at who's the most effective and concentrates on them. That wave: go away. Obliteration rather than contrary force, this time, just, bye, wave.
The outer ends of the wave, left untouched, break outside the battlefield. The water spreads in from the sides and some of the less prepared capes get swept away, but it's certainly better than being hit by the main force.
Of course, all the defenders are clumped together anyway. They're braced for being suddenly underwater, not for being suddenly under attack. Leviathan shatters a shield bubble and charges through the inhabitants, not staying to make sure they stay down before moving on to the next. This is predictable enough for some of his tougher opponents to try to intervene, but he knocks them aside and continues anyway.
Fuck. Healing. Holes in Leviathan. She copies something somebody was shooting at him earlier that seemed to do some damage.
Every little helps. No one can tell what he's fighting toward, or at least no guesses have been relayed through her communicator. The fight wears on, with more and more wounds appearing on Leviathan and more and more capes falling. Tidal waves get smaller and less frequent.
She's got enough of a rotation going that she doesn't feel the need to nip off and build a flying castle. She persists. This and that and the other thing and chasing every new idea as it comes.
And then a plane of water leaps up from beneath her, joined by a plane coming down from above. Neither seems limited by gravity. They even curl inward to surround her. The top layer turns to ice and stops being actively pulled down, but she's still facing being crushed.
The first thing she thinks of is to go insubstantial. She can't breathe while she's doing that; but she doesn't strictly have to.
The frozen wave from above never reaches her. It gets blasted upward by the column of water. Before the geyser falls back down, Leviathan launches himself through it. He flies past Kithabel, a clawed foot stretching harmlessly through her position. The cape in green starts dueling him, freezing his water echo as fast as it appears and striking at him with some less visible power.
Kithabel stays insubstantial and tries to reinforce whatever Green Dude is doing. This is not as directly effective as things she actually understands, but she hasn't done it yet, and its very vagueness means she can combine it with some healing alternating with rain interference, water deletion, and direct holes-in-Leviathan-making.
There isn't much Leviathan can do to her while she's insubstantial. He has plenty of opportunities to strike her himself or with water, but those are all physical attacks. And he gets substantially fewer opportunities when more capes rejoin the fight. They're led by the woman in the dark costume who was in the front lines at Madison, and they can keep Leviathan as busy as Kithabel can.
What he can do is try to hurt Kithabel more creatively. Instead of blocking a hit he could easily absorb, he ducks immediately before a laser is fired. It misses Kithabel, but there's no shortage of potential friendly fire. Next, to test her insubstantiality against those time distortions...
Well, she doesn't want to find out. She can shore up her defensiveness - letting the rain fall - but mostly she just wants to get out of the way.
But the rain means that an increasing number of people don't. Leviathan just has to leap for the woman in the black and gray costume, and he'll end up in the air between Kithabel and a battery of blasters. She hangs on to him long enough that quite a few attacks hit, but quite a few don't. A volley of everything from radiation to railguns flies in Kithabel's general direction at their appropriate speeds.
This seems like a good time to try teleporting again, because there's a little too much stuff to just fly out of the way of all of it even at her high speeds.
After she escapes, Leviathan batters down the battery and resumes pretending he wasn't targeting her particularly.
Teleporting: got. It'll be short-range for now but that's all she needs at the moment. She bops around, doing everything she was already doing but that much faster. Like DRILLING HOLES IN THIS MONSTER.
He pulls himself out of another of those bubbles of slow motion, and checks the damages. There are chunks of monster missing, and more injuries being dealt all the time. He disappears beneath the waves, and the latest growing tidal wave quiets itself.
When it is clear that he is going away, Kithabel sets about dealing with healing and flood damage on an alternating basis.
When they're both cleaning up the results of the flood, the cape in green flies up to her. "You fought well. Made more of a difference than anyone else, even me."
"Maybe next time I'll be able to actually kill one. Didn't take this time when I tried it." She slows down a little so it doesn't look like he's unwelcome to follow, but she keeps flying around, removing water and putting things back together. "I think I was helping you for a bit there but I'm not so good with effects I can't directly perceive."
You think you might be able to kill an Endbringer three months from now?"
"Enough that no one has been able to kill one or even seriously injure them. But if you're as powerful as I am and getting stronger, maybe you can eventually. And I think they know it, too. Leviathan was targeting you, at the end. He was at least paying attention, for one reason or another."
"...If they do that sort of thing I might have to sit out of Simurgh fights until I'm built up enough to shut out her singing, in case she can suddenly get louder or something." Go away, flood. Welcome back to the land of the living, random department store. Kithabel's clothes suffered some damage before she went insubstantial; she swaps them and then shoos more floodwater.