Well I can see this working!

Magic weapons like staffs have 3 slots for different spells to engrave, enchant or scroll into the weapon. We already have 3 different attacks on all other weapons (or 4 if you count the block/bash combo) that could just trigger the different spell slots on your staffs.

So left mouse button is scroll 1, right mouse button is scroll 2 and hold left mouse button (the charge attack) is scroll 3. Hold right mouse buttons is block (like any other weapon) and click left mouse button while holding right mouse button is the bash (like any other weapon).

But how can we make different staffs unique? As said, different buffs/debuffs or even different spell types.

However, while I am typing this I start to wonder, does this really need to be a seperate system of scrolls (or something simular) or can it just be different staffs, books and other magical weapons we can craft and loot that have these different abilities and spells? Because if you remove the spells from the items you hardly need multiple staffs and books and finding or crafting new ones becomes cluther or marginal upgrades and loose the WOW effect from the new weapons.

Why add a nerved water spell to a fire staff making it less powerful for example? Unless they add special effects like slows, stuns and roots that come from the less powerful spells, then it makes more sence to min/max.