Volcanic cave

Behind the Shadowclan camp, locked away in a cave. When you first enter the cave, even in winter, you could notice the warm and still green grass outside the entrance. When you enter the temperature rises a whole ten to twenty degrees, it will stay like that unless you enter the main cavern where a strange red substance sits in pools and rivers. The only cooler places is the hard brown stone in bridges and pathways. This is the Lava cavern, careful don't touch the lava!