Magma dragons are an unknown creation, said to be the leftover energy from the creation of a new volcano. These dragons owe their power to their combined elemental formation, and often mages from both fire and stone will argue over the proper ownership of the species. These dragons are kept by many people though, not just their respective mages, due to their strong fire affinities and their non-violent attitudes. Many potters and weaponsmiths keep these dragons as workhands for their forges, and the dragons enjoy a constant supply of snacks to burn.
The egg has melted into a puddle. Occasionally a shape forms that you almost recognise. It does not move much, only reacting by moving toward things it seems to like or away from those it does not like.
What was an odd little puddle has now matured into a much more recognizable hatchling, with which you can now make out its arms, legs, and wings. It is able to hold its shape for longer now, and is actively moving about seeking food and even follows some basic commands you give it.
Your hatchling has now grown and is capable of taking a complete form. It radiates intense amounts of heat and many of your other dragons stay away from it, while it seeks quick refuge from any of your creatures bearing water power. If it does come in contact with one of these beasts, its flesh hardens in that area and can take a week or two to heal properly, not unlike a wound on a normal creature. It has a habit of igniting any sort of sticks or other debris in its area and you've noticed that if it goes without this feeding it will become lethargic and weak.