True Dragonmorph

Choose one creature  that you can see within range or yourself. You transform the creature into a true dragon, Chromatic, Gem, or Metallic depending on the scale used.  The spell becomes permanent after 24 hours.

The form of your dragon will have the traits of whatever scale used to fuel the spell. If you choose an ancient draconic scale, you gain it's abilities ,and legendary actions but not it's lair action.

You can create a lair if you stay in a certain place for 20 years. After 20 years lair actions can become available, but only if you used an adult or ancient dragon scale for your transformation. If you used a young dragon scale, and the spell became permanent, you will have to wait 200 years for the adult condition of dragons to take place in order for you to gain lair actions

If you are reduced to zero hit points while in dragon form, you revert back to your true form and the scale is shattered. 

If you choose to dispel the spell before the hour is up the scale is returned to you and you can cast the spell again after a long rest. 

If the spell becomes permanent, the scale is absorbed into your body, and you cannot revert back to your original form.

If you are reduced to zero hit points and the spell has become permanent, you do not revert to your original form, but fall unconscious. 

This spell has no effect on a shapechanger or a creature with 0 hit points. An unwilling creature can make a Wisdom saving throw, and if it succeeds, it isn’t affected by this spell.

You gain the stats of your new form, but retain your original alignment.