I'm excited too see how it works. I'm a bit confused on how you can enchant a rune with any spell. There has to be some sort of limitation.
runes can be conjured only with an element called "alcheris", Which means very few people can create runes, there for the possiblities need to be big incase you want to make money by selling runes :3
Think of it, you max amount of elements that you can use is 5
and to have a alcheris it requires 3 of those elements to be Mind,Wind and Arcane, So it means that you only got 2 more extra elements to force runes. Which means runes can not be exactly any spell combination
Still the amount of casting combinations are 25^10 which is... 95367431640625
and since You can cast in multiple ways, 6 ways to be exact, it will be 572.204.589.843.750 diffrent spells
and that covers over all vocation types. Which means, every char will be thier own vocation, you can just select your "priority" between magic, melee, ranged or balanced.
The amount of elements that can be in the stack is magiclevel/10
so i you have the ability to cast 11 elements at the same time if you got 110 magic level.
Oh and since runes are hard to make, they are able to stack up to an amount of elements, but ofc it depends on the quality of blank rune you have