Strengthen Hawkmoon by collecting and generating Orbs of Power.
Together with Crow, you've determined that the paracausal remains of Hawkmoon could accept—and be restored by—the same power that a Guardian wields.
"The Traveler is made out of paracausal material that is, essentially, alive. It responds to the Light like a living being. Maybe that means it could be restored… like a Guardian born of someone once dead." —Ghost