Vecna is a character famous to D&D players. Evidently the ancient undead mage was so powerful that when he was destroyed, parts survived - notably one hand and one eye. These ancient artifacts could be (painfully) substituted for those of a living character, imbuing that character with evil powers. The "Head of Vecna" is a joke artifact, because to use it the character would have to sacrifice their own head - having obviously bad results. This is one step removed from that story, the cruelest cut of all.
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