Lead Witch (new boss)

This new boss would be in a new structure of the swamps, this witch would not only use positions, she would also use black magic. Her main attack would be to launch projectiles similar to the dragon's at the end but smaller. She could dodge arrows by teleporting only when she is not attacking, she could also summon aggressive bats with violet eyes, this she would do when she needs to heal to keep the player busy. This boss would have 2 phases, the first one I already mentioned it and now I'm going to mention the second one. When she has half her life left, the second phase will begin, at the beginning of the second phase the witch will transform into a monster similar to the heart of Ender. In this way the witch could not heal, she would go slower and she could not use potions, she would move like Ender's heart leaving a black block where she passed. The monster would be immortal unless you attack his chest, his behavior would be to chase the player and attack him, among his attacks would be: hitting with his hands, an acid rain (so to speak although the color would be purple), invoke endermites and make a copy similar to steve but aggressive. During the last power that the monster explains, it will expose the witch that is inside it, causing you to do more damage. All the mobs that the witch can summon in her two forms are like endermans or refer to the end.
As for the reward, I have not thought about it so I am waiting for suggestions in the comments.