History of Asher: Conclusion

Asher: Conclusion is a lore entry (9th of 12) in the Duress and Egress Lore book, added in Season of Arrivals. It is a lore Triumph; the seal/category is not stated in the sources I could open.

How to complete

Nothing to grind: entries unlock by progressing the Exodus questline. Complete Exodus: Preparation and then Exodus: Evacuation (the Season of Arrivals Exotic quest) and the book entries unlock as you advance. Per Destinypedia the three Asher entries follow his run on Io as the Black Fleet arrives. The quest may no longer be available in the current game, so the unlock path could differ now.

Summary

After watching his assistant leave Io, Asher Mir enters the Pyramidion to claim its secrets before the Darkness. He fights through Vex defenses, draws down a radiolarian lake and registers himself with the Vex Collective.