Ability Name, Karyokinesis: It's has two forms: Mitosis: Splits anything into two (stackable) and they retain the same qualities.
Meiosis It also splits anything into two(also stackable) but the qualities are halved or seperated, and attack using its will deal deal half the damage or if splitting something than can have multiple qualities, like people, they can have the different genetic traits.
For Mitosis, you can split anything indefinitely but the energy consumption stacks. So, by an equation we can show it as Number of times he has already split the said object or concept × Volume or Energy possessed by the object. For Meiosis, the traits will be different but it a balanced one. Like if one clone gets the strength then the other shall get the speed. Now, if one base stat is greater than the other, the greater stat will convert some of itself into the lower stat till both are equal in value but different in concept.
The effectiveness of the clones depend on the users understanding of the concept or object. He could easily clone a simple thing like knives but may struggle in concepts he doesn't understand like wormholes, blackholes or other abstract concepts. When he uses the ability, the object he wants to split will rapidly swell up from the middle and collapse on itself (Not like stars collapsing tho) , then the object will rapidly re make the lost half(The traits will still be in the whole object).
There's no time limit for Meiosis but the object has to combine back into one to regain the original properties, if one of the copies are destroyed then the other copy is stuck with the divided traits. And also, if one half doesn't die but gets hurt seriously, like losing a part or organ, the when the combine back the traits of the damaged half will be reduced, in equation form it would be its traits of the clones - percent of area( give some other unit if you want)