I've finished the entire game for over a month. I've been through Underworld madness(primarily) and all over the 4 worlds in search of 3* star yellow and 3* crystal (general) evolution shards and found nothing. In fact, I very rarely ever find shards at all. I'm selling 3k plus a day in runes I cannot use as power up runes are almost as rare. I've been to the forum, I've asked my Facebook friends and all are in the same predicament.
All I want to do is finally, finally, evolve my soldier Eddie to level 100. The most important character on my team is the weakest link.
PS Is there a trick to getting the corrupted general? My fave character.