Dvalin without an archer in less than 5 minutes 

At this point I still don't have a very good archer, all the pulls for good archers have failed. The only character that I go recently that could be a potential archer DPS is Fischl (but she is not a very high level). I have to fight Dvalin with what I got because I need him to level up a few of my characters. This has been the more successful combo so far.