It was a chair that Hades, one of the brothers of Zeus, had people who came to the underworld sit down on the chair so they would forget everything.
Hercules once saved 1 person get off of that chair, and not the other because Theseus wanted to marry Persephone, which became the wife of Hades, God of the underworld.
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Hades owned the Chair of Forgetfulness. It would come in twain with your naked flesh and you would forget everything.
Pirithous and Theseus
nepenthe
River Lethe.
Nepenthe is in Greek Mythology (Odyssey) a medicine for sorrow, literally, an anti-depressant - a "drug of forgetfulness". Lethe is the Underworld river of oblivion/forgetfulness.