Talk:Overlord Volume 11/@comment-77.179.73.111-20161003095349/@comment-29248623-20161003145644

Anon please bear in mind that CHARACTER LEVELS UNLOCK OR GIVE ACCESS TO HIGHER TIERS BUT DOES NOT MEAN YOU COULD USE HIGHER TIER MAGIC WITHOUT THE PREREQUISITE CLASSES.

That was already the thought in my earlier post.

Since you brought up Narberal, she is not a pure wizard build and has 1 racial level in doppelganger, 1 job level in Fighter class and 10 job levels in Armored Mage class and War Wizard (I personally consider that both are half-warrior/half-mage fusion class). Her build actually has a built-in deviation that (slightly) limits her from accessing the 9th tier.

You could counter-argue with Ainz's level details. He has 60 job levels in (presumably) invested in magic caster classes and would not be able to attain Overrank if this alone was the referrence point but he also has racial levels in magic caster type undead (Skeletal Mage, Lich and Overlord).

There are still a lot of blindspots in the nature of the mechanics of racial and job levels with tier access but this is just how the story was laid out.