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While I have 20k feathers but I'm running out of barrack space.
In another word, I wopuld prefered to SI or +1 my existing units to free up a space than to promote Arvis now (promoting him will not lose a space but on the other hand I could SI him depending if I got the suitable spared unit).
I have not promoted any GHB unit yet, probably the first one will be F!Robin but only when i got enougth dupes for a 5*+10 unit. On the other side i have all of them at level 40 4*.
Arvis was my first promote. I never got Xander or Camus, and he's the only one I thought was worth it for my barracks so far. He fills the role of res tank and he's great at it if you don't already have Sanaki or something.