Bloatweed:

This common plant is prevalent in the forests of Karnak's surface. It's bioluminescent pustules provide good light, and the liquid these sacs contain have good water content and some nutrients, albeit rather slimy and bland. For more rustic residents on the surface, it's often cultivated inside as a light source for emergencies or where electricity is hard-gotten.

Concept art for Active Assaults. Mixed Media. 45 minutes.