Eternal Crystal

The Eternal Crystal is an  Accessory, that can no longer be created. It was crafted during SkyBlock 0.1. It was supposed to give 5 and. The ability to craft it was removed roughly in July 2019.

Presumed Recipe
It was crafted with a Day Crystal and a Night Crystal, one on top of the other.

The Presumed Crafting recipe.

Trivia

 * The only known players to have this item are SuperTier and Plancke have it reforged to Itchy in their accessory bag, (second link in case it gets deleted), and in their inventory.
 * The admin Plancke has one in his accessory bag https://sky.lea.moe/stats/Plancke/Blueberry.
 * It is believed that Eternal Crystal is blacklisted.