Have you done the quests to gain city charters and received many Essences of Experience? Is your backpack full of these essences? You should speak to the Alchemist, he is very interested in them!
The alchemists can transform your Essences of Experience into stronger Essences of Experience. Below you can find an example:
Example
You give:
You receive:
x 2
x 10
x 20
Mages who have obtained an Essence of Spirit can exchange it with the Necromancer or Koeshu. For an essence of spirit the Necromancer and the Occultist offer you the following choice:
To exchange Essences of Experience go to Cagliostro the Alchemist or Veddun the Alchemist. To exchange an Essence of Spirit talk to the Necromancer or to Koeshu.
Ok, so let me look at this. If I swap 2*50 experience, you will give back 100 experience, if I swap 10*50 experience, I get 500 experience, and if I swap a massive 20*50 experience, I get all of 1000 experience in return. That is some deal!! Am I missing something here, or are we just not meant to do the maths ourselves?
Maybe we can make it so we can trade them for anti-experience elixirs. Now THAT would be nice. :) Or at least for something all the valour players might want... :p
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Necromancer or 
Koeshu. For an essence of spirit the Necromancer and the Occultist offer you the following choice:
