Visit Baba Yaga's hut, go up stairs and have someone stay downstairs and say "hut of brown sit down", then "hut of brown stand up" to release you.
Note: Only 1 person can get it per repop, the cat must be alive, if mark is not awarded kill the cat and wait for it to repop.
For valiantly tolerating being trapped in the cruel Witch's hut, the Powers granted thee a Mark. You have been granted The Mark of Containment! You gain 14 practices!