Demogorgon in the Cave of Eternity. Original from the Minneapolis Institute of Art. https://www.rawpixel.com/image/7652880/image-vintage-art-public-domainFree Image from public domain licenseJohann Peter Magnus. Line engraving by Aeg. Sadeler after himself, 1617. https://www.rawpixel.com/image/14004693/johann-peter-magnus-line-engraving-aeg-sadeler-after-himself-1617Free Image from public domain license