Servant of Mallok
Since right now the Realm Wardens are just avoided for the most part, how about having the dragons drop things that may or may not be helpful depending on where a player's character is in the game such as a random number of medallions, charter tokens and/or silver. Depending on which dragon is defeated they might instead drop bonuses we get from gathering like the carps or scorpions or something else. They could also be made more difficult to fight and Realm Wardens not as common, and they drop 5 parts of something like a dragon toy or an old gnog pack. These are just a few ideas.