Once you have achieved level two Qor, visit Priestess Zuxana and have the following dialog.

Find a level three spell that you wish to find progress towards.

You say, "level three"
Priestess Zuxana says, "Through the darkness of Qor, you can learn enfeeble, defile, poison fog and profane resonance at that level."

Say the name of one of the level three spells, she will require you to become a disciple before charting your progress.

You say, "enfeeble"
Priestess Zuxana says, "To learn that, you must first become my disciple by proving the strength of your faith."

Initiate the disciple quest. Please note, the NPC that she wishes you to invoke Qor to is random. You can use the NPC Quick List to find the mentioned NPC.

You say, "disciple"
Priestess Zuxana tells you, "You wish to be surrounded by the ineffable embrace of our patron Mistress. Your judgement is keen but what of your loyalty? To prove this to me you must invoke Mistress Qor to Lady Aftyn, thus: In darkness all shall be bound. Our Mistress would walk among men in the comfort of a lightless sky and a bloody moon."

Travel to the NPC mentioned and invoke Qor. In this case, travel to Marion and visit Lady Aftyn.

You say, "In darkness all shall be bound.  Our Mistress would walk among men in the comfort of a lightless sky and a bloody moon."

Now return to Priestess Zuxana to finish the quest.

You say, "hello"
Priestess Zuxana tells you, "You have fulfilled my wishes. You are not only wise but tenacious. Seek me out when you would learn more of Qor's spells of power."