Dark Cloud - Glitch Weapon Found
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I searched for this for months after seeing it on one of megahelpman's dark cloud videos, and I finally found it. Its basically a weapon that screws up your game to the point where it crashes the game completely to the PS2 browser.
The weapon's icon changes depending on what menu you're viewing the weapon's icon from. The level of the weapon is -16601, and it has no WHP (Weapon Hit Points) at all. Trying to customize it will freeze the game unless you upgrade it first.
If you try to use it in dungeons, the game instantly crashes unless you're playing on the PCSX2 emulator. To use it in a dungeon, enter a dungeon with a normal weapon equipped, then equip the glitch sword. If you equip the glitch sword before entering a dungeon, the game will crash even on PCSX2.
When you have a glitch sword equipped, Toan will not be holding a weapon, and you won't be able to hit any enemies with regular attacks. The only attack that works with a glitch sword equipped is the Windmill Slash. You can get the Windmill Slash by completing Norune Village to 100%.