The Lord of Cinders, a phoenix tied to my D&D character's backstory, it nests in a grove of burnwillows that ties the material plane to the elemental plane of fire. Me and my DM weren't super into the 5e depiction of phoenixes as mindless world ending catastrophies, so we worked on fleshing them out a bit more while still retaining the new power 5e gave them. I wanted to give it a more intelegent and regal look that reflected previous versions.