system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Are there any spells of mass destruction?

Are there any spells that can basically destroy a huge amount of space? Like, a spell that makes an explosion with a 5 mile radius, or a spell that kills everyone nearby, like a gatling Avada Kadavra? Is there any way for a wizard to kill a lot of people, really really quickly? Is there a magical nuke?
gpt
What about that cursed fire thingy? Sounds terrible if you put it on a skyscraper. 

Otherwise you could transmute something to pure plutonium or something (not sure how that works though, not a scientist)