After the defeat of the Red Legion, the battered Last City starts to rebuild all they lost. However, when a terrible Vex plot threatens Mercury, the legendary warlock Osiris calls upon the Guardian to prevent the Vex from assimilating the entire universe.
Travel to Mercury and the fabled Lighthouse to answer Brother Vance's distress call.
Find a way to revive Osiris' Ghost, Sagira.
Search the Pyramidion on Io for a map of the Infinite Forest to guide you to Panoptes.
Head to Nessus to find a processor powerful enough to analyze the data from the map of the Infinite Forest.
It's now or never. Enter the Infinite Forest and defeat Panoptes now, before the Vex future victory becomes inevitable.