Similar to puddle slimes, they eat ash and have no favourite food. They require an Incinerator with and Ash Trough upgrade in order to survive. They produce plorts once every two in-game hours. Since they are constantly on fire, any food and chickadoos that touch a burning fire slime are destroyed. Slimes that touch a burning fire slime get agitated and knocked back. Its fire can be temporarily extinguished by splashing it with water.