I’m not fully aware of how he did it, but a user by the name of 4x4F dealt 4 sets of damage at once. He is currently a level 22 hunter, and killed a huge-spider in an instant.
I wasn’t able to catch him in action, but I got a screenshot of him in the server.
His weapon was a hunter axe, the tomahawk.
@berezaa , or @Polymorphic, please check this out.