Armiger is the best man in this stage. I could 3* the stage with Athel, Deacon, Armiger (60), Lodric and Warpriest (40). This is a better setup than yours, but two of the champs where only lvl 40 and still didn't die. Turnmeterreduce works great, the boss just doesn't get as many turns as normal. I had leech from Deacon, but your Draconis may replace that healing. 

You mentioned only 4 champs in your team, so Armiger may jump in.

I think Relickeeper doesn't do much in this fight. You could replace him with Templar, to distract the minions in the beginning.

thanks, i think i'll build an armiger. 

But keep in mind my major issue in this stage is the second wave: they have all these reflect damage and block debuffs, and i have no stripper, no healers, nothing. Almost all my attempts end in this stage, so i'm afraid it's not much effective build an armiger

Ok, I thought it's the boss is the problem.

To deal with the reflect damage and block debuffs, Armiger and Templar help. Templar can try to provoke the Medium and the Hound (if I remember correctly, these are the bad guys you're facing). Armiger can hold at least one of them down with his A1. 

Armiger is worth lvl 60 anyway, he is great at Spider and Fireknight. But he likes really good gear, as he needs 100% critrate, accuracy (the turnmeter reduce can be resisted like buffs, so you need acc to land it), def for damage/survivability and speed.

I think Templar should be tried on a lower level, so you can use him as food in the future, when you get better champs from that faction.