Petrified Forest

A new cave biome supported by columns of Petrified Wood, a new stone that resembles a grey wood but with the properties of stone. Logs of petrified wood would also litter the cave floor, along with fossils and pools of tar. Tar would be a new viscous fluid that mobs would sink and suffocate in, all mobs except for the new Tar Slime. The Tar Slime would be a black variant of the Slime that only spawns in Petrified Forests. Their attacks would inflict blindness and stickiness, slowing movement and preventing the player from jumping. This new biome would provide new building blocks in the form of Petrified Wood and new hazards in the form of tar pits and Tar Slimes.