Vanguard
The scout was confused, even as the infection continued to spread, changing its eyes from their glorious multifaceted complexity two simple orbs. not only was it restricted to two facets, but it also had a vastly narrowed spectral range.
Stolen Heart of Fire chapter 16
The rock gave off a soft glow that steadily grew and spread changing the color of the water. the mixture and the steam that arose from it soon gave off the same purple glow as the rock.