According to the records in the "Eight Trigrams Purple Gold Furnace": The Samadhi True Fire is a true fire that is formed by the combination of fire from wood, fire from stone, and fire from the air. It is the essential flame needed for refining high-grade pills.
Moreover, this Samadhi True Fire is exclusively used by cultivators on the Path of Immortality. It is different from ordinary fire that can't be extinguished by regular water and is hundreds of times stronger than the fire sparks Zhang Xiaohua can currently emit.
Looking at the pale red flame inside the pill furnace, Zhang Xiaohua didn't seem to feel its heat. So, he took out a piece of jade from his chest, cut off a piece with his little sword, and threw it into the flame. With a "hiss" sound, the thumb-sized jade piece immediately turned into a wisp of green smoke.
