So I recently rediscovered the quest vault and have been busy making my own custom campaign. However, I can't seem to come up with a good solution to the problem of quest rewards. The usual standby is giving the heroes gold and the overlord XP, but that's hardly exciting or creative. The official campaigns reward unique overlord cards, relics and lieutenant bonuses, all of which seem cheap to reuse for a custom campaign since players will have already seen it before.
There's one or two quests in the Shadow Rune campaign that if the overlord wins, he has the option to use shadow dragons for any quest for the remainder of the campaign, which is a pretty interesting idea, but other than that I'm having a hard time coming up with quest rewards for my campaign. Anyone have any ideas or suggestions?