Dec value: 376
Hex value: 178
Maximum stack 64
Fermented spider eyes are created by combining sugar, a brown mushroom and a spider eye in any crafting interface. The positions of the items don’t matter, so you can create them in your inventory’s crafting interface.
Fermented spider eyes are used as an ingredient in brewing recipes. They will always corrupt the potion’s effect, which could result in a potion of weakness, potion of harming and potion of slowness. These potions are, of course, best turned into splash potions by adding gunpowder.
Spider eyes can easily be farmed as spiders can be found everywhere. Dungeons occasionally have spider spawners, and abandoned mineshafts have plenty of cave spider spawners. This makes creating a spider farm very easy.