A Space Whale in the MonsterVerse (AU)

Above Caelicetus's head, light unnaturally bent and was absorbed by a needle-sized black hole. Time around him seemed to slow down.

Winds picked up, the sky cleared, dust particles flew, and debris that was falling started to float, first peddles, then ist-sized stones, quickly increasing in size and mass.

All getting crushed and sucked in by the growing black hole, the difference impossible to notice as it was not the one he usually made. This one was not an imitation, as such, it needed to be fed more mass.

The Xenomorph Progenitor didn't stay idle and with a mighty flap of their wings, they speeded to Caelicetus. A city block flew off the ground and smashed the Ghidorah on its side before getting swallowed by the baby black hole. 

The only thing it did was slow it down, but time was of the essence, a black hole this size would not be dangerous in itself for a being such as them. But it was forcefully fed by the space whale and what would take millions if not billions of years was done in mere seconds.

Volcanos awakened, lava flowed, earthquakes shook the planet, and every living being on the planet felt their doom approaching. The yautja capital was now mere rubble getting eaten by the black hole. 

The only yautjas left were on the other side of the planets, floating to their death or flying away from the planet, however, doing so was no easy task as the gravity of the planet was acting irregularly and constantly fluctuating.

The Xenomorph Progenitor dodged another massive piece of stone and roared in anger, it was shrill, inhuman, and high-pitched, not dissimilar to chalk friction on a blackboard accompanied with thunder. Then they rushed in Caelicetus's direction,  bladed tails spread they dived.

Aiming at the middle brain. Suddenly the suction force of the black hole increased, a bellow of the earth and a part of the crust was torn off. Instead of piercing the space cetacean, the tails deviated. 

One was shredded by the black hole while another cut the two left front flippers in half before digging into the flesh alas without doing anything more than skin damage. Detaching the tail it exploded, acidic blood burning the whale skin. Caelicetus barely felt the acid and loss of two limbs, too concentrated on the task at flippers.

The atmosphere shifted, gaining the attention of the hydra whose left head looked up and they thought, 'We need to retreat.'

It was already too late to run, however. And they will learn it in a very short time.

One of the five moons orbiting around the planet, the smallest of the five, changed orbit. Its speed while seemingly slow was all but.

It pierced the atmosphere, from the ground it was a giant fireball. The inhabitants on the base burned and died on the spot as this moon which was a third of Earth's moon approached Caelicetus.

It broke apart in three, each dwarfing the space whale but all bent unnaturally under the force of gravity, crushed it was devoured by the baby black hole. The entire moon barely affected its size.

This caused a chain reaction as another moon orbit changed, then another followed, and another before the biggest of them all no smaller than Mercury followed. The planet, as big as it was, roughly five times Earth in mass didn't fare any better.

From space where Caelicetus was located lava flowed in abandon, the crust pilled off, and nothing alive remained, turned to dust. Now the size of a penny the black hole gained strength. Strangely it didn't affect the space whale, as if immune to its effect. 

After all, compared to the one at the center of the Milky Way this one was puny, and incomparable, in mass, size, age, and power. And his body could 'swim' in it. 

Unlike the Xenomorph whose escape was impeded. Already hundreds of kilometers it tried to fly into outer space but couldn't, roaring in rages they pushed even harder. They were not safe, as from here they could but feel the terrifying power of the black hole devouring everything and only growing stronger faster and faster.

*BOOOOOOM!!* 

The biggest moon slammed into the planet, shaking it in its entirety, and bright orange cracks formed all around at extreme speed. All visible from space. If it were to be Earth-sized the planet would have exploded. This was soon followed by the three other moons, each causing their little apocalypse. 

The shockwaves traversed the planet so loud that they blew everything that was still standing, mountain bigger than mount Everest was blown away like cards castles. Ground flattening before cracking and exploding.

In a remote area, a small four years old youngling, a juvenile yautja, stared with terror as the approaching dooms in the far distance. A tall female yautja on his side clicked, her voice broken and full of despair before the shockwave transformed both of them into blood droplets, "What have we done to deserve this fate?"

The black doubled in volume, and Caelicetus in trans only cultivated it even further. It felt good to bath in its powers, it felt safe. But that was not enough, the Ghidorah was alive, and it wouldn't have died that easily.

The crust on his are having been devoured let place with the mantle taking its place, it was hell. Magma from deep with defied the planet's gravity, soon the mantle thinned out, and at that moment a piece of the planet broke off. The cry of agony would have been heard by him if he wasn't in that state.

The black hole now the size of a watermelon continues to grow, crushing the part of the planet that breaks off. The Xenomorph Progenitor already hundreds of thousands of kilometers away felt themselves being dragged back. To their despair, any force pushed into their body did nothing to stop it. 

A rhythmic thrum vibrated through the graviton of this solar system, originating from Caelicetus' heart and only amplified by the black hole. At that point what remained of the planet was no more than a broken melting ball of iron and gold, and with a last silent cry, it was devoured by the black hole.

At the heart of it, all was Caelicetus, wavering between consciousness and unconsciousness, the black hole, now more than 300 meters in diameter covered him like a warm and comforting blanket, the sound it made was like a lullaby. His skin slowly mending.

Alien to the human ears, capable of breaking their mind into fragments.

On its rim, the Ghidorah desperately moved to move away but the traction was too strong, the ts body progressively getting shredded apart, from tail until only the three heads remanded, all soon disappearing into the black hole.

At that exact moment, the black hole stopped getting bigger, and a part of its energy gets absorbed by Caelicetus, invigorating him and fully waking him up, not fully comprehending at the moment what exactly transpired beyond the mind-boggling pain cracking his body. 

He would have noticed the tingling around the golden sphere of his head, right behind his last pair of eyes.

The rest of it concentrated above him in an unstable colorless ball no bigger than a tennis ball but half the mass of Jupiter.

'It's going to explode in humm 37 seconds… and I can't control it.', he instantly remarked, and this explosion would kill him. The only sure escape was warping but with his current state warming safely would take more than one minute, and warping it precisely would take even more time.

This is why before his thought was finalized he was already swimming, his speed rapidly surpassing the fastest plane, exponentially increasing every microsecond, approaching a tenth of the speed of light faster than he ever did.

And it exploded, burying everything ok it's paths, Caelicetus out of the solar system and felt his body shiver as the waves of energy washed over everything behind him. Destroying dust particles, moons, planets, and the red sun at the heart of the system alike. 

If he could see he would say, the entire solar system is covered in a bright, somehow black-and-white light then nothingness. Though, he could feel it and was horrified, not only by what happened but by himself.

"What have I become?"