Detached Eyeball

One of these can be used by an arcane spellcaster to restore a spell of up to third level that they have already cast. Two eyes are needed for a spell of fourth to sixth level, and three eyes beyond that. They are worth about 900 souls.

Scholars have long believed that eyes retain traces of information they perceive, but it was the anatomist who learned to exploit these resources to enhance his arcane power.