Nawamara Ujio tells you, "Bring me a blank augmentation gem and I will teach you to increase the duration of your spells."
Nawamara Ujio tells you, "Visit Fiun Rehlyun on the Halaetan Islands if you have not already acquired a blank augmentation gem."
You give Nawamara Ujio Blank Augmentation Gem.
Nawamara Ujio tells you, "Use this gem to increase the duration of the spells you cast. Remember to read the gem's inscription before you use it."
Nawamara Ujio gives you Archmage's Endurance.
You allow Nawamara Ujio to examine your Archmage's Endurance.
Nawamara Ujio tells you, "I can do nothing with this gem."