It is not uncommon to find pools of Lava in the caves. The caves in The Lava layer are often light up because of the lava. To mine in the lava layer you need at least an Iron Mining Cell. It is not possible to use Excavators on this layer. Hot Feet and Warmworms spawn in the Lava Layer. Temperature on The Lava layer is very high. Walking on the hot rocks of the Lava layer will make a heat-scale show up that will fill itself with red color for as long as you venture in this hot environment, until your player-character will start to burn if no counter-measures are applied in time.