Enchanted Tomes

Enchanted Tomes could be a way to add more depth to enchanting your tools. Tomes would give you the ability to bring one enchantment one level above its max. For example looting 4 or knockback 3. You would only be able to find tomes in loot chests of structures with some enchantments only being able to be found in certain structures. To apply a tome onto a tool you would need the normal max level of the enchantment on the tool. You would then be able to combine them via an anvil for a high xp cost. Some enchantments like mending or infinity wouldnt have tomes for obvious reasons and some more could also maybe be excluded or made very rare for balancing reasons. For example a protection 5 tome should be made very rare because it would obviously be very overpowerd to have a full protection 5 netherrite armor. You would also only be able to apply one tome to one item. You would have to decide which enchantment you want to upgrade one level above the rest. For example your mining pickaxe could be upgraded to fortune 4 but you could make a seperate one for farming blocks with efficency 6. This encourages to make more seperate tools for different tasks and helps with balancing. The lore of the tomes could be that they where created by ancient powerfull mages and left behind. The player isnt experienced enough to be able to create them themselves. This would be the reason for them only to be found in structures.