OK thanks for the explanation and letting us know we keep our loot if we win the battle with the Bosses in the Heroic level.

I guess I'll advise players to have few resources on them when they attempt the Heroic and resist the temptation to revenge if they're new to the game and don't quite grasp the long term effects of doing that. It's so easy to click a button and become the farm of your attacker in this game. I am glad it's now just 1 time per day. That's much more manageable and won't discourage new players.