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Artefact compression is a complicated spell used to imprison its target in a small figurine. The spell was used on Yennefer by Francesca Findabair after the events of the Thanedd coup, allowing the Queen of the Valley of Flowers to smuggle her colleague off the island and back to Dol Blathanna. She kept Yennefer in the form of a jade figurine for forty-seven days before releasing her and putting her forth as her chosen candidate for the Lodge of Sorceresses.
Artefact compression is also one of the spells used in the PnP RPG game "Wiedźmin: Gra Wyobraźni".