When you are able to choose the Sword of Aeons at the end of the game, throw it into the vortex. When you fight Jack of Blades again in his dragon form, choose to destroy the mask. Then, go back to the Guild and go to the place just outside of Maze's quarters, where the fountain is located. Read all of the little stones. One of them will give you Avo's Tear. Avo's Tear has mana, health, & experience augmentations on it. Hop I helped.
acually, you only have too destory the sword of aeons, it was the first item i got after the human jack fight