They can be won on Bamboo Island, purchased from the Moonlight Merchant for 100 Rupees, or found in Treasure Chests across the land. They are also very rarely dropped by Cursed Bokoblins, Dark Lizalfos, and Dark Keese. On some occasions, they are dropped by Gossip Stones after awakening them with the Goddess's Harp.
- ↑ "A chunk of pure, crystallized monster malice. Often obtained from monsters who possess the power to curse." — In-game Description, Skyward Sword.
- ↑ "You got an Evil Crystal! This solid chunk of pure, crystallized monster malice is extremely rare!" — In-game Description, Skyward Sword.
- ↑ "OK, one Evil Crystal it is! For 100 Rupees it's all yours!
- ↑ "Various treasures are required to upgrade items at the Scrap Shop. Among them is a precious treasure called an Evil Crystal. It may be possible to obtain one by defeating a monster that can curse." — Fi, Skyward Sword.
- ↑ "And Monster Horns come from the monsters who carry them. You can claim them for yourself by using some sort of tool to snatch them away. Evil Crystals often come from monsters that cast spells. Dark magic... It gives me chills... And rarely, so very rarely...a Golden Skull will be found instead of an Ornamental Skull." — Sparrot, Skyward Sword.
- ↑ "Hey, kid! Looks like you're a bit short on materials. You don't have enough Evil Crystals. According to my grandpa's notes, you can get 'em by slaying monsters who have the power to curse you..." — Gondo, Skyward Sword.