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Opening Spider Door

You now have the option to use your own blood instead from a prisoner, to do so put in Health when Dreaming with Spider Door, doing so will always turn it into a new Severe Injury, it decays after 30s into Decrepitude and needs to be treated with Vitality: Lesson Learned or Heart 10+ influence to restore.

If you feel that this is too easy, you might want to try Entering Wrong Door mod by AspringChampion instead.