
Since there is no such word as "mysticated", and since the Doors lyrics often reference literary tropes, I think that the best interpretation is "mystic, heated wine". This would then allude to the drowning of Clarence in Shakespeare's Richard III, who was drowned "in a butt of Malmsey."
Malmsey is a sweet Portuguese wine that is heated during production to achieve a certain flavor and color.
This is entirely consistent with other lyrics from Doors' songs, where they reference such works as Frazer's The Golden Bough.
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