Taken directly from VS Battles Wikia.
A sub-ability to Void Manipulation, Existence Erasure is the ability to erase things from existence.
Going beyond material destruction of even vaporization and atomization, this power can, at most, cause complete existence erasure of the body, mind, and even the very soul of the target, rendering it as if they had never existed at all. The end result leaves no trace of the target, making it exceedingly difficult to counter unless the victim has displayed resistance to such abilities.
More powerful users can go even further, going so far as to erase the concepts that make up reality itself such as time and space or other such concepts of existence.