Koios Vivifica

Koios Vivifica is the current Lord Herald (chapter master) of the Angels of Rebirth as well as one of it's oldest non-Dreadnought Marines. Previously the Chief Librarian, Koios was chosen to succeed the previous Lord Harbinger when he was killed during the Macharian heresy.

As a mighty Psyker, he fully understands the dangers of the warp and under his guidance the Angels of Rebirth have won dozens of battles against the forces of Chaos, from banishing hordes of deamons, to foiling the plots of the Black Legion itself.

History
Not much is known about Koios's life before he joined the Chapter as an Acolytum. Over the course of the next 300 years his Psyker powers grew to impressive heights and he became an Epistolary faster than any other Librarian in the chapters history.