[Changes and additions]
The terminology for staff (weapon) and rod (magic device) were the same in the Japanese version. Their names - both when identified and unidentified - are now different. This change does not affect the English version because the names were different to begin with.

The potency of rods now increase as the user's Magic Device skill and character level increase.
Charges obtained and used when drawing and filling charges remains dependent on Magic Capacity.
The potency of potions now depends on the user's Alchemy skill level. (If the potion was thrown, it depends on the throwing character's skill level). This is to make the three consumable item types depend on different skills.

It will also no longer give the user Magic Device skill experience; instead it will now give more Alchemy skill experience.
Changed how potency of scrolls and potions increase with their respective skill levels and with character level.
Their potency is now also increased by the "enchances your spells" equipment attribute as well as the Magic attribute.
The plan is to make these items slightly more powerful than their spell counterparts because they are consumables.