Did something change with the skill at some point? Because I can't seem to make Hand of God using the combinations mentioned in the iRO Wiki page/Divine Pride/etc.,
I get the same error "[Change Material] Inconvertible Combination" that I get when I tried to make 2 Tiger's Footskin. Yes I know, that combination is disabled in iRO, which is why I decided to give it a try to see if it was an issue with the character or the combination. I then tried to test and managed to create Fabric out of Soft Silk so it wasn't the character at fault. Nor was it due to the 100 unique items limit, which my Gene is nowhere near to.