Burnt Thorns

Burnt Thorns are a block added by the Twilight Forest.

They don't spawn naturally; they can only be seen when a player uses the Lamp of Cinders on a normal Thorns block. Unlike the normal and Green Thorns blocks, a player can walk into Burnt Thorns and won't take any damage. Instead, the block will disintegrate. The same thing happens when Burnt Thorns are trying to be mined.