What Was Dumbledore's Patronus Novels & Stories

I say, stressing the 'sir'. It is a big wonder, that a warlock is head over the entire school… "Feisty. That I like." Principal Eldor smirks, bringing out his wand. My legs instinctively move backwards, he burst into laughter. "...oh, my my. Little Hermione is scared. I didn't think I'll get to see the day where the Phoenix is scared." He jeers, laughing loudly. Phoenix. Phoenix?!! "How did you...You just called me..." "Phoenix? Oh yes, who wouldn't know?" He smirks, appearing in a flash before me. I opened my mouth to scream, but nothing, only a gasp escapes my mouth.