Dak'kon is a great warrior <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
If I am not mistaken there are circles of magic knowledge, at least this is true for our githzerai Dak'kon and his Circles of Zerthimon.
In the left of the spellbook you can see spells, you have memorized, on the right are spells available to you in this circle for memorization. As you grow stronger more spells become available to you for memorization (in the left of the spellbook).
So, now to memorize new spell from right you need free slots in the left. Either you lvl and get new slots or you empty some slots that are already memorized (just click on memorized spell and you will have option to dememorize it).
Hope this helps.
