Help Asher investigate the Pyramid's influence on Io:
- Collect a sample from the Taken Phalanx, Barrism in the Lost Sector: Sanctum of Bones.
- Collect Traces of Corruption by defeat Taken on Io
"." - Asher Mir
- Having talked with Asher Mir on Io, it is time to head into the Sanctum of Bones across from Asher Mir.
- Go inside the Lost Sector and start fighting your way through.
- Not much will change inside the Lost Sector initially, aside from getting the Traces of Corruption from each Taken you kill inside it.
- The big change is at the end of the Lost Sector, where you will find Barrism, Altered Phalanx in addition to Pandrok, Pillar of Nothing.
- Defeat Barrism to complete this part of the story.