Phoenix's Flight

You and your familiar learn the secrets of elemental fire, allowing you to merge together to become a legendary creature—a phoenix. You can cast Monstrosity Form as an innate occult spell once per day, except you can transform only into a phoenix, and your familiar must be adjacent to you before you Cast the Spell. When you Cast the Spell, your familiar merges into your form. While transformed, you gain the Blazing Conflagration action.