11. He named the business Mortmain and Company, also called Mortmain 's. 12. Mortmain witnessed his parents'death at the hands of the York Institute.13. Possession of property by a corporation such as the church was known as mortmain . 14. Nate reveals himself as Mortmain 's accomplice. 15. The Institute inhabitants return from the meeting and begin searching for information on Mortmain . 16. Mortmain 's vendetta with the Clave is the driving force of the series.17. In the morning, when the caravan is about to leave, Mortmain is missing. 18. To protect herself, Tessa Changes into the angel Ithuriel, whose spirit kills Mortmain . 19. The lovelorn heroine of " I Capture the Castle " is named Cassandra Mortmain . 20. These were followed by the Statute Quo Warranto and the Statute of Mortmain ( 1279 ).