There are no materials other than coins to upgrade unless you are doing the plans. I have previously been able to upgrade beyond 10. Some of my heros are already beyond the 10 others not. For example, 3 of my heros have lvl 11 relic. My others are @ 10. I know there was the ability to upgrade them beyond 10 because I have done so, but now they seem to have put a stop to it. I fully understand the concept of the plans and having to have specific materials to complete the plans. My complaint in regards to that is I have won 3 plans that have never been delivered



