Using my ARMAX to get all the weapons and items early (after I had already beat the game and accomplished everything several times) then being shocked to find that there were even more items lodged in the game's code and getting a bunch of items that said "RESERVE" on them in my weapon list after getting out of the Confiscatory, and figuring out that one of those RESERVE weapons was actually the coding for Belias's spear, so I ran around for the next two hours killing things with a giant spear larger than myself.