Incarcifors is a Transforming spell that transfigures an object into a suitable prison for a nearby creature, allowing it to capture or imprison the victim.
Etymology
The prefix "incarci-" probably comes from the English "To incarcerate" and the suffix "-fors" (often used in transfiguration spells) is Latin for "chance, luck, fortune", though it may also come from "forma" (or simply English form) meaning form.