When this quest was first introduced, Lord Asheron himself would collect the materials necessary for the repairs. Now Asheron has delegated the collection of materials to his servant who resides in the main tower (not the sanctum). Once you have him enough materials to build his golem, he awarded you the title Artisan of Flame and Light.
Asheron tells you, "Welcome to my home! I owe your people a great deal. Because of you I am still able to continue my efforts to return my people to this world."
Asheron tells you, "Humans shall forever be friends with the Empyreans."
Asheron tells you, "I have been told much of what happened here while I was held captive on Bur."
Asheron tells you, "Thanks to your people the tower was well defended and with your help I was able to build a more permanent defense with my Tower Guardian."
Asheron tells you, "You may test yourself against my golem if you wish. It will learn a great deal by battling your best warriors and mages."
Asheron tells you, "If you still wish you may bring me Crystal and Pyreal that I can store for later use in repairing any damage the Guardian takes in Defense of the Castle."
Asheron tells you, "There is a note on the table here that lists the types of crystal and pyreal I can store for the future."
Asheron forms the head of the golem.
Well done Tenchi Rei! For being the final contributor to my creation you shall be known as an "Artisan of Flame and Light."
Tenchi Rei turns in the final resource Asheron needs to build his golem. Asheron prepares to activate his golem on his island to the east.
Asheron says, "I must go and retrieve my new golem's weapon. I shall return in a few moments."