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The Evil Crystals (Japanese: エビルクリスタ) are items in Densetsu no Starfy 3 which are only obtainable after defeating altered Ogura for the first time. These items are round, red crystals used together to truly defeat Evil. While 40 of them are found at the end of past levels, one of them is given by the Pufftop Scholar, while Ogura holds the last one as a source of power.
Starfy, Starly and Moe seek advice from the Pufftop Scholar on how to stop Evil, who then answers in a lecture that all 42 Evil Crystals must be gathered, as defeating Evil without the crystals will not truly defeat him. When Starfy, Starly and Moe return to Old Castle with 41 Evil Crystals, they realize that they are short of one crystal. Evil torments them, until Ogura appears to spare the last crystal. This puts an end to Evil, and peace is returned to Pufftop Kingdom, however Ogura had sacrificed his life to help Starfy and Starly in the process.
- Treasure Items - 45 treasures in Densetsu no Starfy and Densetsu no Starfy 2.
- Answers Cards - Similar items that are found by revisiting past stages in Densetsu no Starfy 4.
- In the correct 'locate the mistake' picture Mad Piero shows Starfy, Starly and Moe in Misty Town (Stage 3-3), Starfy is holding an Evil Crystal instead of what looks like a tomato on the wrong picture.