The Firefly is a block similar in appearance to the Cicada and it illuminates light. Fireflies are a common block in the Twilight Forest. They occurs naturally on the trunks of Twilight Oaks, Mangroves, Canopy Trees, and in Hedge Mazes. Additionally, you can sometimes find Fireflies as treasure in some of the various chests around the Twilight Forest. Fireflies can also be used to make a Firefly Jar.