From Destinypedia, the Destiny wiki
While fighting to retake The Last City from the Red Legion at the height of the Red War, Omnibull fought alongside the Hunter Vyhar and Warlock Rana Untu in the streets of the city while The Young Wolf assaulted the Cabal's flagship The Immortal to assassinate Dominus Ghaul and free the Traveler from its imprisonment. As they fought, Omnibull ordered Vyhar to get behind them from protection as Incendiors assaulted their position. They then noticed that Ghaul had turned into a massive being of Light near the Traveler, and were horrified as the Cabal began cheering, believing that they had won and Ghaul succeeded in stealing the Light. Omnibull continued fighting as Gladiators joined the battle, but began to despair that the Vanguard's plan had failed and that they had lost. However, Rana pointed out something was happening with the Traveler, which broke free of its cage and destroyed Ghaul before restoring the Light to all Guardians and enabling them to liberate the Last City.
List of appearances