From Command and Conquer Wiki

Divination was the name for Nod Military applications of Tiberium technology during the Second Tiberium War. The process was developed in order to create the perfect human, and was heavily based on earlier Nod research, from project ReGenesis.

Basically, it was controlled processed tiberium injection into a human bloodstream. The tiberium would act as a mutagen and slowly mutate the subject. Due to the control, the mutation wouldn't be random and rampant (e.g. visceroid as an effect) nor unpredictable (The Forgotten), and the resulting subject would be, essentially, perfect. The pinnacle of the research was the World Altering Missile, which contained a warhead capable of transforming the world at an atomic level, from carbon based to tiberium based life.

The missile and much of Kane's research was destroyed and salvaged by GDI. Also Umagon, halfway through the treatment, has gone insane after the administration of Tratos' experimental mutation vaccine.

Divination technology was further researched after the Firestorm Crisis. By the Third Tiberium War, Nod had developed Tiberium infusion technology based on the Divination research.