Glow Lichen generates naturally on stone, deepslate, dripstone, and various other surfaces in caves below Y=63 across most underground biomes. The block is multifaced — meaning it can attach to any of the six faces of any solid block, including ceilings and slanted overhangs, with each face holding an independent lichen patch. The block emits light at level seven, soft enough that it does not fully illuminate a cave but bright enough to mark passages and prevent some hostile mob spawning.

Unlike most light sources, this material is renewable through bone meal: applying bone meal to existing lichen causes it to spread outward to adjacent stone-family surfaces, allowing builders to grow large glowing patches across cave walls without manual placement. Shears collect the block as an item; mining without shears destroys it. Stacking lichen on multiple sides of the same block is fully supported and gives the block additional decorative depth. The block is one of the cleanest ways to add ambient cave lighting without resorting to torches or Sea-Pickle bushes.