Conqueror's skill Overcome The Odds seems to be bugged atm. it was intended to give you more defense the more mobs surrounding you, but with a maximum of 10 mobs, if more the defense bonus wouldn't go higher than if there were 10 mobs
But it ain't so, there's no limit to how many mobs you can get the beneficial defense bonus from.
Can't confirm this myself, haven't got a Conqueror, but I've been tipped by Conqs .
Correct me if I'm wrong. Hope you enjoy.