forelight

noun2

1. •
   A forward positioned or forward facing light, especially one used to guide, direct, or navigate; beacon; (by extension) a signal; indicator

   • Each miracle was a foretoken, and forelight, and firstfruit of the restoration of all creation. When he healed the sick, that cure was a forelight of the sickless state. — 1864
2. •
   Light emitted prior to or in anticipation of an event; a previous, former, or early light

   • The City, it seemed to her, knew it dimly, with a yearning faint as dawn's forelight, which grew stronger with each passing hour, inevitably. — 2003