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Here's my suggestion: Make it so you can apply attributes to an enchantment like you can with regular mythic items

Attributes: MainHand: MovementSpeed: 0.2 Damage: 1

And then have it so those attributes are added to the attributes of the item its enchanted to. Additionally, make it so enchanted books containing the custom enchant maintain and apply these attributes when its put onto an item. (make the attribute stuff work from anvils as well as direct enchanting)