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Zombie brains are drops from zombies, angry zombies and furious zombies, they are used for a few thaumic items and are one of the few items which contain the Exanimis essentia. They can be used for the Arcane Ear.

When eaten, they may cause Warp or temporary warp.

You theorise that they may be useful to your work in golemancy, but for now you should probably store them.