There is a blob, one of many blobs in a small universe, floating around that universe is a huge ball that the blob knew it needed to evolve into something new and exciting, as did all the blobs. Only one can have it and there are lots of blobs; They are driven by instinct and immediately attacked one another. the blob is different it hangs back and watch the fighting closest to it, which is two blobs, when the fight was ending the blob struck at the injured blobs and enveloped the weakened blobs one at a time.
It continued to do that again and again each time getting stronger and smarter, but so were the other blobs, they were using tactics, the biggest where just going around, enveloping all in their path while the smaller ones where ganging up on the big ones, when they killed a big one they eat till there was none left and then they fell upon each other until there was a clear leader, then they ganged up on the leader in an endless cycle.
The blob is now bigger and dived in to a swarm and enveloped seven right away, getting bigger and stronger for each eaten, it rushed thought the free-for-all melee leaving an empty trail in its wake. It was also getting smarter and notes super packs of smaller blobs tearing big blobs apart, it will try to avoid the super packs when it can.
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Time has no meaning; it eats, runs, repeat.
Two super packs have run into each other it's a massacre ten thousand each side, the mess drew in thousands more and it turned into a free for all. When the last few were fighting it out the blob swoop in and finished them all off easily for they were half its size. It had just finished the last blob and is heading for the huge ball; It was barely 1/20 of the ball’s size but was thousands of times bigger than at the start.
It tunneled inside, once it was at the middle it merged with the ball and went in to hibernation. It was absorbing the fabric of the universe; it was growing limbs, six legs, two arms and three body parts, its arms have a serrated claw for grabbing and cutting, 360` sight, legs that will walk upside down, and wings, the perfect killing machine.
It can feel the universe splitting apart; It sees light for the first time. it was ready to destroy, to kill all living things, TO DESTROY THE UNIVE *splat* a careless stone thrown by a careless kid.
IT, the great slaughter, the universe destroyer killed by a kid who won't even know it happened.