The egg in Deltarune does not have a confirmed in-game purpose yet; as far as the game shows, it is a secret item that can be used with no visible effect, and it disappears at the end of the chapter.

What it seems to do

  • It’s obtained from a hidden man in secret areas.
  • You can “use” it, but nothing happens.
  • If you drop it, the game reacts with “What egg?”
  • In some cases, it can affect Asgore’s fridge in a small, strange way.

What players think it means

  • Many fans treat it as a lore clue rather than a normal item.
  • Common theories connect it to hidden memories, family drama, or Gaster-related mystery, but none of that is confirmed.

Practical answer

So the safest answer is: its purpose is to be a mysterious secret tied to the game’s lore, not a functional gameplay item.

If you want, I can also give you the most popular fan theories about what the egg symbolizes.