Assassin/Blackguard Spellbooks and Dispels

[Simian]

In a nutshell:
When our Assassins and Blackguards are hit with Dispels;
Do we use our "character level" to determine the 11 + "spell effect's caster level" like with UMD, or do we use our actual "spellbook caster level?"

Hopefully simplifying example:
- A level 30 character, 10 levels of Assasssin + Practised Spell Caster Assassin.

Is the dispel check done against:
a) 11 + 14, or
b) 11 + 30?

If it is b), then those two spellbooks just became considerably more interesting...

[Luna]

I'm not sure. You may have to ask on Kaedrins forum.

Unless Rasael knows?