Joshua shook his head. "The only way to reopen the World's Gate after collapsing it is to summon the One, from all three personalities, and utilize its power to force a new path from the Gate. Which is, of course, impossible. Not just for humans, but for angels as well. And I'm pretty sure SAISEI couldn't open it back up either if he wanted to. So we're stuck here."
"Well, that's sad, now isn't it?" When you turned to the source of the new voice, you realized it was Aero. She had a wide smirk on her face.
"What are you doing here?" Joshua asked. His expression was completely neutral.
Aero shrugged. "Bored out of my mind. SAISEI took all the armies and led them into the various worlds. Once the rest of humanity is crushed, we'll move onto the angels. But right now, I have nothing to do, you know? Since the universe is coming to an end soon, why don't you all try to fight me?" Her mechanical arm began to whir and spin.
"Hey, did you know? I can open up holes in the Rift that lead to the outside world. So...if you beat me, I'll let you leave this place, not that you'll stop SAISEI anyway."
Her words charged you with energy. A way to exit the Rift had shown itself. But you also felt a tinge of vengeance. This Jaeger was special: she killed Alita without any mercy. It's time to reciprocate, you believe.
"Ah! You're all ready. Show me what you all got, swine." Her eyes closed and she began to chant a series of words that seemed to hold significant weight. "I am Aero, Curse of the Twelve, Born from Chaos, and the Signal of the End!" With each word, she seemed to gain more power, and she began to glow. Her mechanical arm began to turn from a rusty gray to a shining gold.
Joshua showed little reaction from her power surge, only noting, "You expect me to reveal my title in return? That won't be necessary. These humans will deal with you without me needing to interfere."
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Objective: Escape the Rift
Aero has awakened into her true form with the declaration of her title. She will likely be several times stronger than Moto ever dreamed of being. So...good luck, I guess?
For reference, the longer the title, the stronger the entity. Joshua's title is quite long, and so is SAISEI's. Aero's title is far more moderate in length, but she is still a powerful entity. For comparison, Moto's title is Warped Warrior.
I would imagine that a title can get longer as the individual gets stronger and obtains a stronger identity.
Oh, and a regular human has a title so short that it's literally useless.