[@Cojemo]
So, something like widespread worldwide destruction. I want to ask, is its power regulatable? As in, can he shoot a weaker version of it at someone like Gilgamesh can with Ea? Otherwise, unless he specifically wants to wreak destruction on the world it's sort of useless.

Actually, the only things I can think of that something like that would actually be useful for, would be if there was something very large in space that he wanted to destroy, or if he was trapped inside a reality marble. Which, actually, is not that useless in something like a grail war, or against Dead Apostle Ancestors...

Also, considering the definition of the world at the time, you might say that its destructive capacity could be limited to wreaking havoc on an land area around the size and surrounding seas of India.