Why come there doesn't seem to be a way to kill the other leaders and heroes and take their magic items from them? Other games such as MoM and Shadow Magic gave you the opposing leader's stuff if you beat them in combat.
Maybe it would be too OP to take everything since the heroes and Sovereigns regenerate. Suppose they "dropped loot" though, suppose Kraxis is defeated the little combat ledger window shows that he dropped his sacrificial dagger (but kept his other gear). Each time you defeat a champion/sovereign they should transfer a random one of their items until they are utterly defeated at which point either the rest of their stuff goes completely away except for one item transfer, or you transfer it all from the battlefield.
The same system could work against you as well, you lost in battle? there goes that lightning hammer that you had.
Maybe an item could be dropped as a green treasure icon when you are defeated, assuming that the tile is available to do this.
There are options, it would be neat to implement something like this in this great game.