Agosoria was a Borothan religious event that celebrated the continuing cycle of creation. This event was celebrated every eleven years during the eruption of the Great Plume of Agosoria.

During the time of Agosoria, tradition held that worshipers fasted, though the group of pilgrims that boarded Enterprise NX-01 in 2151 broke with this tradition out of hospitality.

On the morning of Agosoria, the traditional greeting was "Roja durana tua teenan," which meant "May the plume light your way."

Before the eruption of the Great Plume, worshipers recited the "Invocation of Renewal." (ENT: "Cold Front")

Prah Mantoos met Captain Jonathan Archer with the greeting "May Agosoria embrace you into his cycle of renewal," indicating that perhaps Agosoria may be the name of the deity worshiped by the Borothan.