Dragon Familiar

To cast this spell you must form a pile of at least 10.000 gp and place a dragonscale on top of the pile. The type of dragonscale determines the type of dragon that is summend by this spell. You must remain within range of the pile for the entire duration of the casting time. The casting fails, if you move out of range or any material is removed from the pile before the spell is cast, in which case the dragonscale is destroyed. When you finish casting this spell the dragonscale and any gold in the pile turn to dust and a dragon appears on the nearest unocupied space within range. 

The summoned dragon is of the same type as the dragonscale that has been used as a component for this spell and it uses the statblock of a young dragon of the corresponding color. The dragon acts independently of you, but it always obeys your commands. In combat, it rolls its own initiative and acts on its own turn. It is sentient and aware of the how it was created. It behaves similar to other dragons of the same color, but it shares your alignment, ideals and flaws at the time of casting. 

When the dragon drops to 0 hit points, it disappears, leaving behind no physical form. However, anything the dragon was wearing or carrying are left behind. Recasting the spell creates a new dragon, who does not share the previous dragon's personality or memories, unless the dragonscale used for the recasting stems from the very same dragon as the one used before. You can not have more than one summoned dragon at a time. If you cast this spell while you already have a summoned dragon, the spell fails at the end of the casting time, using your spell slot in the process.

While whithin 30 feet of the dragon, you can dismiss the dragon into a pocket dimension by concentrating for 10 minutes. As an action you can use a 9th level spell slot to make it reappear within 120 feet. If Dispel Magic (or a similar effect) is successfully cast against the dragon, it disappears into this pocket dimension instantly. Whenever the dragon disappears into this pocket dimension, it leaves behing anything it was wearing or carrying, with the exception of magic items it is attuned to. The dragon requires food, water and sleep as any other young dragon of its kind would, unless it is in the pocket dimension. Time seems to almost stand still for the dragon while it is in the pocket dimension and it is unaware of anything happening outside of it. 

While the dragon is on the same plane as existance as you, you can communicate with it telepathically. Additionally, as an action, you can see through your dragon's eyes and hear what it hears until the start of your next turn, gaining the benefits of any special senses it has. During this time, you are deaf and blind with regard to your own senses.

Finally, the dragon does not age or grow over time and remains a young dragon for as long as it is under your control. If you die, the dragon is freed from your control. You can also use an action to touch the dragon and free it from your control willingly. If you die while the dragon is in the pocket dimesion, it reappears in the nearest unoccupied space. Once the dragon is freed, it ages and grows naturally and adopts the personality and alignment that is typical for a dragon of its kind. However, it retains all its memories and, depending on how it was treated, might consider you and others as a friend or foe afterwards.