by pmsupport » Sun Apr 10, 2016 8:59 pm
Hi alkis, each material card with the identical active skill will give you 15% chance of upgrading the skill. It's recommended that you use 6 materials cards with the identical active skill to get a 100% chance to level up your skill. Each skill upgrade is independent. There is no guarantee that you will surely succeed after failing a certain times.
Enjoy the game!
Playmage Support