The Iron Dragon. Throughout their life, the temperature in their womb increases, and fifteen years after hatching they reach 3250 °C inside and 140 °C outside. By eating heavy metals and rocks, they strengthen their "skin" and by adulthood it becomes inaccessible to any kind of damage, and therefore death from external factors is impossible for them at this stage. When absorbing Ore and rocks, part goes to maintain the body and part is deposited on the outer part of the skin, this factor makes these dragons a kind of treasury, because passing through the stomach, breaking through the skin, all metals from the ore turn into pure nuggets, and crystals undergo additional processing, for example, the largest crystals can be found on their bodies the diamond. This process of joining together with metals can be seen more clearly in the tail of this dragon, it forms a kind of club, and is also used. It is necessary as a means of attack and defense in the battle with their own kind for the right to reproduce. These dragons grow throughout their lives, and closer to old age they acquire so many gifts of the earth that they resemble walking mountains more than living creatures, as well as a sign of imminent death. Sensing the approach of the end, these dragons are looking for high mountains or volcanoes to become one with them, finding them they go deep into the empty space and die, leaving dozens of tons of jewelry and metals after death.