Always annoyed with Oblivion's way of handling 'leveled' spell effects...

[Kai]

Turn Undead you get early on says it works up to level 3, the problem is to know what 'monster' of undead that it fits up to level 3 is weird when you can over-level past that almost easily.

Skeletons will be basically the most common until 'Champions' or such appears, but even then I don't know if 'Skeleton' as a class of enemy has level variants in them like a lv1, lv3, lv5 variant.

[Kai]

If you wear armor, it caps up to 95% spell effectiveness, so this "level 3" for spell ACTUALLY only works for level 2 and below if you wear any armor, due to it using a magnitude of points, divided by 4, and rounded downward.