Can only be destroyed by bombs, and it has a chance to drop souls hearts rather than cash/hearts/bombs. Also, this room cannot be encountered inside the Cathedral or Sheol, but are available from the Upper body. If you find this space during the Upper body and you've got no implies https://libertycapbindingofisaac54073.blog-a-story.com/8493031/liberty-cap-binding-of-isaac-secrets