My group found once a chair. If you sit in the chair you sleep forever (if nobody push you out of the chair). After 3 month a body on the chair crumbled, leaving Co-Vis (works only with a living body).
The magi had long and often discussions, if and how to use the chair (only evil persons, only criminal or enemies or unliked peoples...) - but in the end they got corrupted, using random kipnapped peoples to let the Corpus-Vis Production running ...