The abomination was a rare kind with immense power and the ability to conjure limited clones of him within a certain area around his location under several conditions. He can't conjure more than twelve clones at once time, and the combined strength of the clones can't surpass double his power.
He's also limited by any magic clash, which means the moment a clone gets into a fight they can't modify their power. That's right; the clones operate separately from the main body and don't share thoughts, but that also allows them to die without damaging the main body.
His clone ability mainly relies on him predicting what fights are going to be hard and what is going to be easy and then adjusting the power output of the clones. But, since it's been over several thousand years since he was sealed, and the unnatural power of Arad's group, all of his predictions were thrown for a loop.
