If a unit with fury has a damage aura, it will gain damage when the aura damages friendly units. What's more, stacking multiple auras on a champion appears to have double the effect. I tested this out with champions like The Displaced, Savage Wolf, and Vengeant Knight, with Burning Crusade and Grant Magic Aura. The affected champions were capable of gaining upwards of ten damage a turn, and it isn't long until you have a 100+ damage monster on your hands. This doesn't seem like it was intentional, since the description of Fury specifies "opposing champions". It seems like the mechanic triggers for any damage done to a champion, period.
