Players can openly attack others in the wild. If a Lux kills another without cause, that Lux is marked with Gloom as some of the victims Lumen is taken.
As your Gloom increases, your character is surrounded by a dark shroud, causing Fear in others and hiding you at night. Be careful with Gloom. It makes it harder to protect the goodies on your corpse if slain.
“Hauling around lots of XP (a.k.a. Lumen) causes you to glow! It may help you see better at night, but it also attracts unwanted attention.”