They are roughly classified into 2, use items and junk items.
Use items lower the number when used.
Use items (1)
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Use items with equivalent effects to restorational magics, etc.There are 32 ones classified into 4 with the code Y*-(* is in A to D).
Use items (2)
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Use items with equivalent effects to offensive magics, etc.There are 32 ones classified into 4 with the code Y*-(* is in E to H).
Use items (3)
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Use items with equivalent effects to indirect magics, etc.There are 32 ones classified into 4 with the code Y*-(* is in I to L).
Use items (4)
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Use items with special effects.There are 32 ones classified into 4 with the code Y*-(* is in M to P).
Now under construction.
Junk items
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Items whose ways to use are obscure.There are 127 ones with the code Z*-(* is in A to P).
Now under construction.