Triti is the third strain of GUILT encountered in Under the Knife and Second Opinion. Triti is also known as the "Contagious Nightmare." Triti creates a series of triangular membranes on an organ that petrifies the organ. Each edge of a membrane is held in place by a thorn. When a membrane is excised, Triti will attempt to extend its membrane to cover more of the organ. Triti was based on a failed cancer treatment by Caduceus Europe which somehow came to Delphi's attention.