For the FFWiki.
It is possible to make Edward invincible to damage and constantly attacking by casting Berserk on him as he is in low health (using Tornado on him works best in this case). Edward will try to Hide as normal, but will return to the battle and attack non-stop as a berserked character will do, but will still be count as being hidden. The only downside to this glitch is if Edward is the only one on the field, then he will no longer be Hidden and can be targetted by the enemy.
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The psycho Edward bug is a bug from the Game Boy Advance port of Final Fantasy IV. Normally...