Actually I don't know how to make some stuffs, if you're able to help me with that...
1) How to make a script call to make the player can equip those special items?
2) How to make some equipment restrictions (for example -and returning to your example- you can't equip the Aries stone if you have the Scorpio stone)
3) How to make those items equipable only for certain characters (example: Only Ralph and Natalie can equip the Scorpio stone)
4) How can I make those items cost certain slots to be equipped (example, the Gauntlet has 3 slots and you require 2 to equip the Aries stone)
I don't know how to make all those stuffs, if I can fix that, this system is perfectly viable