system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] How much damage could an experienced wizard do if they went on a rampage?

An experienced wizard from the Harry Potter universe decides they want to cause as much death, destruction and chaos as possible.

What can they do to achieve this and how successful would they be?
gpt
People always forget that one little spell from Deathly Hallows. Its called FIRE FIEND and it releases giant flame demons that consume everything in their path. Apparate from city to city and cast this spells and you've got some major damage there.