Sorry about not responding sooner, but I rarely check my page.
The Keyblade is obtained from the Zombie Locksmith, and it has a drop rate of about 5-10%. I did it by saving right in from of the Locksmith, fighting, using pheonix downs to kill him in 1-2 turns, rinse, repeat.
The Keyblade isn;t that good, though. It has a power of 26, and the mace commonly dropped by the undead is a 22, and is much easier to get. It is handy in the hidden zone, though.
I got a mummy cornered with a king, and it's the CPU's only piece left. I'm on the Genius difficulty, and the AI is LITERALLY taking forever to think. I guess it can't decide between killing itself and suicide. Cheater... =(
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