Glimmering Nanites
Source
Interstellar Species pg. 26
Your nanites emit pinpricks of colorful light. Your nanite cloud sheds dim light in its space and each space adjacent to it. You can suppress or activate this light as a move action. This light can be used to communicate in Lumos and other light-based visual languages you know.
Dragonscript
ID
4dfaddfd6629ff9908ec69cb