Let's run down the list. The Ellimist's physical body, such as it is, was destroyed. He's a non-corporeal higher-dimensional being, and don't you DARE claim higher-dimensional tiering is false, it's stated so within the verse itself.
He is capable of body manipulation, forcing the Animorphs out of roach morph against their will, dream manipulation, reality warping and space-time manipulation across a universal scale, intangibility for his physical avatars, he can erase people from existence like with the Hakai not just so their motion through time ceases at that precise moment, but that their whole generation of ancestors going back through history is wiped out, he can teleport people through space and time millions of light-years and back again in an instant, he can freeze time, he can rewind time, he can form pocket dimensions, he can read people's minds, he is a master of illusions and altering your perceptions, he can change your emotional state, he is capable of manipulating technology too, and unlike Zeno-sama, he has complete mastery over entire timelines, shifting and just generally rearranging them at his will. It's like he's become a sentient universe across a tenth-dimensional plane, confirmed by the resident alien science expert. You might be right in saying there is no such thing as an omnipotent being, but characters like the Ellimist are the closest thing you can get in fiction. The Ellimist is so broken he could literally solo anyone within DBS. How are you going to fight all that? You can't. You can't fucking fight that. If you think so, then you're just being a moron."So," she said after a while. "Why don't you want to use this Time Matrix thing?"
I waved my stalks forward and back in a gesture of uncertainty. <You can't just go messing around with time. They say it's insanely complicated. Sure, maybe I could go back, like Chapman said, and stomp out the first Yeerks who evolved. But who knows how many other things that might affect? Besides, to be honest, I guess I'm scared of the Ellimists.>
"The what?"
<Supposedly they're the race that built the Time Matrix. Thousands and thousands of years ago. They built it, and then, suddenly, as far as anyone can tell, they vanished. The entire species of Ellimists just vanished.>
"You think it was because they used the Time Matrix?"
<No one knows. Some people say the Ellimists still exist, but they've moved beyond the normal space-time dimensions we know. There are some who say the Ellimists are almost all-powerful.> I shrugged. <Of course, there are others who say they're gone forever. Or even that they never did exist. Now Andalite parents tell their children stories about the Ellimists.>
"Fairy tales."
<Are fairies magical beings in human mythology?>
"Not just fairies. We have elves and leprechauns and Santa Claus and hobbits and werewolves and vampires. . . . We even have aliens from outer space."
Despite myself, I laughed. <Yes, those outer space aliens are quite troublesome.>
"Doesn't the Time Matrix prove that these Ellimists are real?"
<Well . . . I don't know. But if Ellimists are real, if they really do live in dimensions beyond our own, then they have powers we could not imagine. Pretend . . . never mind.>
"No, tell me," Loren urged. "Unless you have something else to do."
<Okay, well, you know that space-time has ten dimensions. There are the normal dimensions of up/down, left/right, and forward/back. Then there is the fourth dimension, which is time. Then, there are six other dimensions, but they are curled up into themselves, so we don't see or feel them. All we feel are three space dimensions, plus time.>
Loren nodded her head. I wondered what this meant. But she didn't ask me to stop, so I went on.
<Imagine if, instead of three normal space dimensions, we only had two. Imagine we were flat, and we couldn't go up or down, just in the other two directions. Call us the Flatties. See?>
"Like if we lived on a piece of paper," Loren said.
<Exactly. It would be like we were drawings on a piece of paper. And if someone came along and drew a box around us, we could never get out. Because the lines of the box would be walls. But what if a three-dimensional person came along? A three-dimensional person could lift that Flattie right up out of that box. The Flattie wouldn't even know what was happening, because he's never gone up or down before. He doesn't even know up and down exist.>
"You're saying we're like the Flatties. Except we're in three dimensions, not just two. So we're like Cubies or something."
<Yes. So if some creature came along who existed in more dimensions than us, he'd be able to do things that would be impossible for us.>
"Ellimists. That's what they are?"
<Maybe. Like I say, no one knows. But someone built the Time Matrix. Someone real. Someone who isn't around anymore.>
"Whew."
<So maybe we could use the Time Matrix and pop in and out of time. Or maybe we'd disappear, like the Ellimists may have.>
"Or maybe we'd just make these Ellimists mad," Loren said.
<Exactly.>