I don't know about everybody else, but I love Easter eggs!
Each Easter egg would have a quest that you would unlock upon completing the Easter egg.
For example:
Did you hear that?: Apparently, a big-eared monster has been spotted in venture cave! While, most Heroes laugh at this request, there might be a grain of truth in it... Anyways, he is offering a big reward.
Reward: 600 gold, Horn horn
Horn horn: This musical instrument made from a goat's horn emits a piercing blast of sound when played. When heard, this awful noise stuns all monsters, lowering resists to 0 and making them not fight back, until hit.
(Use a monster whistle at level 10 summons Billy Big-Ear, a goat boss, if you bring back his goat horn as a trophy you complete the quest.)
Please, everybody Post your ideas!
Billy Big-Ear
"Hey, don't you know it's impolite to stare? It isn't my fault I was born this way! Hey, are you even listening? That's it, you're goin' down sucker. You messed with the wrong goat!
Special: Magic resistance 50%, Berserk 25%
Hp: 600
Damage: 50