there are a few things wrong with that formation.
If i remember correctly I had beaten the lb relic guy before I defeated pompey but it was around same time so for now sense you are using calvin and letting your main die in round one i am assuming you do not have lb sets
the first is in the bottom row you have pompey, herja, and shayde. neither shayde or pompey needs herja so there is really no need to have her live so long in the fight
the second is you have pompey going last. watch a fight and see what round he starts doing less damage than shayd. It is most likely the 3rd or 4th but depends on how much damage each does, plus he doesn't stun.
There are other things you can tweak but if you can understand these 2 and take the time to watch your fights you should figure them out on your own which is always the best way to enjoy your game. while watching the fights there are many that determine your formation such as the order your guys die,the order they attack, and the skill of the heroes you are using. Even runes will effect your formation such as how much hit shayd has.