Which great class ability do you dislike?

The wizards' ability is worse because by this level, you usually already know all the necessary spells, and in principle, this ability doesn't change anything.
Elemental Fury is worse... IMHO.
For the Knight, at least achieving the ability gives you all the necessary skills, but leveling up a Warlock WITHOUT magic just for Elemental Fury... I think it's very debatable.

Wizards need this ability because they will learn all the spells. I leveled it up for Zehir. And then, with the "All-Knowing" skill, you get 4 skills for leveling up + 4 magic school skills. After all, all magic schools are given, and in a normal game, you have to find spells, level up the skills of that magic, but here there are many more spells, it's very useful in the campaign, although I defeated the Overlord, Biara, and Markel with Zehir using Banish, but then I had 9 skills:
light magic
dark magic
chaos magic
summoning magic
higher education
spellcasting
attack
+ you can also take 2 additional skills.