this Is gonna be a series where i talk about the aliens on my Ben 10 fanfic kinda like the Ben 10 wiki, but different. i'm gonna change some informations like removing or adding some weaknesses depending since in the cannon Alien X has some weakness...
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Alien X is the omnitrix's DNA sample of a celestialsapien from the forge of creation. The celestialsapiens have amazing powers being able to alter reality with a thought, but this has a setback as celestialsapiens have 2 personalities inside of them with Bellicus and serena being exclusive of Alien X. Those personalities must agree on something in order for the celestialsapien to do something even to blink, otherwise they only stand motionless, but even with this they are nearly invulnerable to any attack as shown by Alien X when the annihilargh exploded right next to him and he not only survived as he took no damage from it and wasn't even on guard.
Paradox has even gone as far as to call them "omnipotent", which places them at a multiversal level scaling above paradox's chrono-navigator which has been said to be able to destroy an entire multiverse if misused. Celestialsapiens are appearantly immortal, If not extremely long-lived as they can live tens of thousand years before even being considered "mature".
Celestialsapiens can have they're abilities absorbed by osmosians or entities with similar powers like darkstar, though it doesn't really harm them.
Their actions on reality can be neutralized or undone by the intervention of another celestialsapien or Very strong entities.
Gourmands can digest celestialsapiens, but only if they do nothing to stop it. Even though that could destroy their physical forms It wouldn't be enough to really kill them. They are also immune to a nemuina's sleeping dust as they are life forms that never sleep and have 2 consciousness.
Their personalities also cannot be scared by toepick's face, though Ben still would feel terrified If he looked.
Their life energy could be drained by a vladat and also by anur vladias, the anti-life planet, though that would only destroy their physical forms and not really kill them as they are transcendent beings.
In order to truly kill a celestialsapien it would have to destroy their very existence which is Very hard and can only be done by another celestialsapien or entities that scale on par with or above them.
They are also immune to mana as they can manipulate, create and destroy at Will, even though they never really mess with it.
They are not limited to the Basic laws of other realities, unless the reality in question has a stronger entity or item preventing them from it.
When they combine their powers together they are able to do completely unnimaginable things beyond comprehension such as being able to resist omniversal destruction and even go on par with entities like the abstracts such as Eternity, Infinity, Oblivion, Death and even a few beyonders, which is one of the main reasons they are respected and feared in the omniverse, though they refrain themselves from making contact with other realities's entities as they want nothing with them. However they are afraid of entities such as The living tribunal, The one above all or The presence.