Eggs-istential is a CastleVille Legends quest given by Magnus, immediately following the conclusion of his Wooden You Know It quest. If timed correctly, it shares elements with part of Rafael's All Keyed Up questline, and at this early stage, it shouldn't be hard to have the two quests running concurrently.

This quest is followed by Magnus' Scrambling for Breakfast quest, which also coincides nicely with the next part of the All Keyed Up quest, so keep producing those eggs and get ready for the next quest!

Quest Requirements:
Have 1 Chicken Patch
Gather 5 Eggs
Make 3 Cheese

Quest Rewards:
1 Crown

Castleville Legends Wiki