Many know of the secret cult of followers known as the Cult of Osiris and their leader. Osiris was once a hero of the battle of the Six Fronts. But his desire for truth about the purpose of Guardians and the nature of Darkness drove him to madness and to his eventual exile from the City. Osiris has yet to be seen ever since his exile, but one of his disciples, Brother Vance, has appeared in the Reef. In honor of Osiris, the Cult created a crucible tournament called the Trials of Osiris in order to recruit the toughest Guardians to their cause. Guardians from all over the galaxy take part in the tournament. The first rounds providing little to no challenge, giving these Guardians false hope. Towards the final rounds of the Trials, Osiris himself sends his most formidable champion to truly test those who seek the legendary Warlock himself at the lighthouse on Mercury.
Dibbblet, a multi-flawless and unbelievably powerful Sunsinger Warlock, stands between you and ultimate victory. Dibbblet is not immortal. But with Sunsingers, death is only the beginning. A Tlaloc by his side with unbelievable firepower and an ability to unleash a fury of grenades that will burn you to ashes. Dibbblet decides who gets through to the lighthouse, and who will think of Osiris as only a myth.