Champions ranking in champions screen
This is merely curiosity, but when one selects ordering ones champions "By Rank" in the champions screen, what criteria is used to determine the order? As an example, I've currently got Warmaiden ranked first, followed by Frozen Banshee, then Elhain, Royal Huntsman, Apothecary and Robar rounding out the first six. The amount of HP isn't diminishing (Apothecary has more than Elhain), it's not any crits, nor any other stats I can see.
Again, just curious as to the method of ranking. Thanks.