Yes, it's really hard to find the evolution shards required to go from 3 star to 4 star. REALLY HARD. I have been grinding all sorts of levels for a couple of days (I can't count how many times I've run certain missions) and still 1 short on the 2 star green shard. Just give you context of how much I'm grinding, I have 12 2-star evolution shards (white), an average of 25 1-star shards of all colors (except white which I have over 50). My talismans are maxed out ( I have had to sell a ton), and an average of 30 evolution runes of each color. In addition, most of my characters that I use have talismans at 3-stars, level 30. I have 2 eddies at 3 star level 60, my soldier just upgraded to 3 stars and I have enough shards to level him to level 60 instantly. My support character that I use are almost maxed as well, and still no 2-star green evolution shard. If I don't get it It will be really hard for me to advance without the help of troopers.

They really need to come up with a system to fix this. I love Maiden and this game is fun, but it will get old really quick if I can't advance (grinding nonstop gets old fast). I can imagine non-maiden fans who like the game can become quickly discouraged and stop playing if they were in my shoes (and I'm sure a lot of people are in the same boat). I hope they implement a system to combine 1-star shards and turn them into 2 star shards. It would really help.