From Destinypedia, the Destiny wiki
They can be identified by their green, moss-covered frames and ring-like attachments on their heads. The moss on their bodies shows that they have been in stasis for quite some time, apparently frozen in rapture by some unknown revelation. There is little information on the purpose or goals of the Sol Divisive, but what precious insight has been gleaned suggests that these Vex behave religiously and are central to Vex actions in the solar system.
In Season of the Undying, the Sol Divisive launched invasions across the Moon, led by thousands of copies of The Undying Mind itself, in an effort to secure entry into the Black Garden itself from the Guardians. After months of Guardian operations to destroy the copies of The Undying Mind, their invasions ended, but some Sol Divisive Vex remained.
Major Axis Minds
List of appearances