For the floating orbs of light in Twilight Forest, see Fireflies.
Firefly is a block added by the Twilight Forest. It is similar to the Cicada added by the same mod. They illuminates light and are a not uncommon in the Twilight Forest. They occur naturally on the trees of Twilight Oaks, Mangroves, Canopy Trees, and can be found in Hedge Mazes. They may also be found as treasure in some of the chests found in the Twilight Forest. They can be brought back to the overworld and placed on any solid block.