The Void carpet and Mysterious Remains are rewarded from the Heart of Destruction Quest. No creatures drop the Folded Void Carpet by itself.
You get a chance of getting a Folded Void Carpet from using the Mysterious Remains. I'm going to include all the bosses that drop the Mysterious Remains and show you if they also drop Gold tokens because I know you don't want a token boss. The only two who don't drop tokens of any kind is The Percht Queen during the Wintersolstice event and the Sinister Hermit (Blue) during the Cults of Tibia quest.
Source: https://tibia.fandom.com/wiki/Mysterious_Remains
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