Vantablack was an N+1 dimensional creature. That's what they'd answer if you asked them because the real answer was too bothersome for the "flat ones". Those with too little dimensions. In fact, Vantablack had way more than N+1 dimensions. But attempting to explain that involved too much math and N*log(N) manifolds so they gave up. It was easier to go with a white lie. So if you, quadridimensional creature and reader, asked Vantablack how many dimensions Vantablack had, he'd say,
"I have 5 dimensions, one more than you. No, you don't have three dimensions, you have four. You're forgetting time."
And that would not be a hard lie, because any creature that has N dimensions also had N-1 dimensions. A small omission, if you want to be rigorous. Vantablack didn't.
Vantablack had a lofty goal. Devour the multiverse. After too many headaches (and after you go past K dimensions they increased exponentially), Vantablack decided it would be easier to just end it all. Devour the multiverse, break and unwrap those manifolds and restart it anew with an easier set of basic operations. One that could scale linearly over the dimensions. After they decided to devour it, he had to set a date to start.
You might be reading a pirated copy. Look for the official release to support the author.
Unfortunately, Vantablack decided to wait until all their favorite web novels in some famous amateur site finished. He was in for the long run.
There was one funny trait Vantablack had. Just like when you press your finger to a sheet of paper the two dimensions of the paper see only your fingerprint, Vantablack had a pinky that when intersected with our quadridimensional space, looked exactly like a human. They could even wiggle the finger or pull the muscles to emulate human behavior.
Vantablack was happily browsing the web when after visiting the favorites page in their profile and noticing a third of the bookmarked web novels were in hiatus. That dreaded state where you can't even tell if the author was still alive.
A multiverse where it is unknown if Rainer would rescue the baby Arcane Elemental or if the Bandit King would get his period or not wasn't a multiverse worth keeping.
Vantablack decided to reschedule his timeline and devour the multiverse. NOW.