Lantern

Lanterns are orange glowing objects made by Scavengers and obtained from trading or stealing from them. Most Scavengers carry them in dark regions, mainly in Shaded Citadel but sometimes in Subterranean. Lanterns cannot be thrown as weapons, but can function as a distraction when escaping enemies. Lanterns are extremely useful for traversing dark regions such as Shaded Citadel and Filtration System because they're the second best light source available, second to the glow gained from eating a Neuron Fly, and are almost necessary to platform in dark areas at the beginning of the game.

Trivia (Spoilers!!)

 * Lanterns generate the same radius of light as having eaten Neuron Flies, so they are the best light source before reaching Five Pebbles or eating one from Moon.
 * It is heavily implied that Lanterns are made by Scavengers using Blue Fruit shells and Slime Mold. Moon comments on them saying they appear to be "...a pupa shell, smeared on the inside with a glowing substance?", and Slime Mold is the only orange glowing substance in the game.
 * The map can be used as an inefficient replacement for Lanterns, since the map reveals platforms or paths even if they are in the dark.
 * Going through Shaded Citadel as the Monk allows the yellow Overseer to outline the area around the player character, letting players skip the hassle of obtaining a Lantern.