1st Edition. Live Action Role-Playing rules for the horror worlds of HP Lovecraft. Great LARP system with the flexibility to handle conventional horror as well as the Cthulhu Mythos. Note that this is first edition of the ruless. 3rd Edition was released in the summer of 2006. While 1st edition is still a good system, there have been some major overhauls and improvements in the system with 2nd and 3rd edition rules.