Channel Spirit

Uses all of Azrael's life force to summon his spirit, a black dragon. Azrael becomes a dragon for the duration of the fight, or until the dragon dies. If the dragon dies, Azrael's hit points are reduced to 0. This spell uses the highest spell slot, plus 2 of every lower-level spell slot. When the spell ends, Azrael is unconscious and immediately receives 5 points of exhaustion, and receiving one more results in death. At 11th level, Azrael is becoming more powerful and is able to exhaust less power while using the spell. It only uses one of the highest spell slot plus 1 of every slot below 5 and Azrael only gains 3 ticks of exhaustion. At 17th level, Azrael has honed this ability and it only uses the highest spell slot, and Azrael receives no ticks of exhaustion afterwards.

3rd level: Young black dragon

4th level: Juvenile black dragon - 150 hp - 18 ac - +9 to hit (+4) - 40 ft - 11 d8

5th level: Young-adult black dragon - 172 hp - 18 ac - +10 to hit (+5) - 50 ft - 11 d8

6th level: Adult black dragon

7th level: Aged black dragon - 252 hp - 20 ac - +13 to hit (+7) - 70 ft - 13 d8

8th level: Elder black dragon - 309 hp - 21 ac - +14 to hit (+7) - 80 ft - 14 d8 - 2d8 bite acid damage

9th level: Ancient black dragon