Am currently writing an evil monologue* and I was wondering, theoretically, how much antimatter would a person need to create an explosion (or other suitably destructive devastation with a side of either incineration or annihilation) that could have a radius of several light years. (double digits is preferred) And would that explosion be bigger if that antimatter was condensed to the size of a pin head, à la a black hole's singularity. And if so, how different would the radius be? Science side of tumbler, please, help a writer out.
(containment, creation, and release of the antimatter will be handwaved as magic but scientifically plausible methods of the above would be appreciated. I really just want accurate numbers since a character will be explaining this.)
*evilness debatable, destructive intent not

















