Each monster is double-sided. You will need 2 copies of Being from Xicotl, Devoted One, Lodge Initiate, Oathswearer of Dagon, One of the Thousand and Shantak. Several monsters which were in earlier versions of this expansion have been moved to the Arkham Nightmare instead. The only monster which is required for play is the Martin’s Beach Horror. The Tindalosian Pack is required for use with the Tindalosian Ichor item, whereas the Hu-ghoul is required for use with the Consume Likeness spell.