The Miracle Egg is a crafting material found in Castlevania: Curse of Darkness. Evil Core Lv.42 (Garibaldi Temple) and Golden Bones (Baljhet Mountains and Tower of Evermore) may drop them. You can also find one in Dracula's Castle.
Even if it's known to be one of the rarest materials in Curse of Darkness, there's an easy way to get them very early in the game:
- In Baljhet Mountains, go to the Save Room located just before reaching the arena where the fight with the Wyvern takes place.
- Equip your best Luck raising items (Clown Suit or Prince's Clothes, Rare Ring, etc.).
- Summon your best Luck raising Fairy-Type Innocent Devil.
- Keep entering and exiting the Save Room until Golden Bones appears, instead of the three Skeletons which usually spawn in that area. Defeat him and he will drop a Miracle Egg.
Note: You don't have to fight the three Skeletons every time you exit the Save Room. Golden Bones always spawns alone, so as soon as you see more than one enemy spawning, you can enter the Save Room and try again.
Even very early in the game, when your Luck stat is most probably around level 20 and your Fairy-Type Innocent Devil only grants Luck +1, it doesn't take too long until you get one Miracle Egg.