Yes, all the lists are necessary except for the "possible items" list, which is just used to create a random inventory for demonstration purposes.
I also changed the music and sound effects. The weapon costumes are placeholders; if this system gets used in the final game, Sunny will change the appearances of the weapons. @Kittengirlgames made the base battle system. Music: Tuffer Upper! by Robin Blend Sound effects: -Critical hit: Pokemon. -Inventory item breaking: Minecraft. -Error/heal: Scratch library. -Hit: Undertale.