Emeria Angels, like most angels in Zendikar, bears a halo worn low over her eyes, symbolizing her mystical blindness to the Eldrazi's atrocities and her powerlessness to aid her world. The halo stings when worn this way, letting the angel see only stark, glaring whiteness and barring her from coming to the aid of the Eldrazi's hapless victims. Ultimately the halo serves as a shameful kind of leash, shackling her to acquiescence, preventing her from interfering with the destructive progress of the Eldrazi.
Her connection to the land signifies less of an alliance with nature than a need to explore the skies for a solution to her tragic bargain.
When the earth shudders, the sky overflows.