Can someone please explain what this means?

>>The top-level restriction is calculated according to (20 - summation seed 1 of (caster's ranks/2)). For example, a caster with 50 Magic Item Use ranks waving a smooth amber wand at a target will cause it to be unable to cast spells of level 14 or higher.

Thanks.

Thanks for the info, but it still makes very little sense to me.

>>>>The top-level restriction is calculated according to (20 - summation seed 1 of (caster's ranks/2)). For example, a caster with 50 Magic Item Use ranks waving a smooth amber wand at a target will cause it to be unable to cast spells of level 14 or higher.

This one is a little confusing, even when you understand how the summation chart works.

Ranks	Spell Level
6	18
12	17
20	16
30	15
42	14
56	13
72	12
90	11
110	10
132	9
156	8
182	7

When the caster (waver/invoker) of 1708 has the number of ranks listed in the first column, the target may not cast any spells equal to or greater than the level listed in the second column.

~Denil