According to wiki,The staff must be enchanted to totally int+4 or matk+2% and +7 refining to be exchangiable to empowered staff.
I have just used up 1000 mora coins and failed. I have seen the pattern that the 2nd slot can only be int+1 and dex+1 and never become matk+1%.
This topic is created for request the proof that wiki provide the true information not the troll.
Thank you in advance.
PS. Those coins I collected for whole 2 years since I'd begun playing this game. I feel I have wasted the time in my life.