Minecraft wiki entry for Cauldron, associated text: Cauldrons can be used to hold lava. In Bedrock and Education editions, when a cauldron is already filled with water, it empties the cauldron and makes an extinguishing sound. A cauldron filled with lava emits a light level of 15, similar to lava, and burns any entity inside of it; in Bedrock and Education editions, this includes mobs that do not take damage from lava like zombified piglins.