Collect Calcified Light fragments on Io, Titan, Mars, and Mercury using Ghost's Nav mode. Defeat Savathûn's Marionettes on Io and Titan.
Eris believes the Pyramids offer a gift in a form we will understand: weaponry. But the branch seethes with an unstable Darkness.
"Hidden chatter tells of ancient Light bubbling to the surface, coaxed forth by the Pyramid's reshaping of our worlds. Furthermore, Savathûn's scouts chase the Pyramid like hungry dogs. She chains their will with ritual and spell-craft. Destroy them. Let the branch consume the Marionettes' bound essence and stabilize it by consuming calcified fragments. My incantations will coopt Savathûn's binding ritual and link the Pyramid's gift to you." —Transmission from Eris Morn