Disclaimer: I do not own Harry Potter.
I smelt death and decay. At first, I figured it was my natural body odor as a literal Death Eater now. But then I was able to detect it coming from a direction. I crack open an eyelid and blink, once, twice, thrice. Yeah, that's Dumbledore. Since when did he smell of death? That's probably a bad sign.
I yawn and it comes out as a roar. I turn open my massive form, and I think I'm even bigger than before I slept. My claws come crashing down on the rocks digging huge trenches as I climb to my full height.
Dumbledore is on guard, more so after my apparently threatening show. It's not my fault everything I do is impressive now. Is that my cloak? I growl and narrow my eyes. Oh look he's pointing his wand at me, how cute.
He's flapping his gums now. Talking about how I've become a threat to the light. How I was keeping the souls of evil from being punished and at risk of being resurrected. Claimed that the dementors I devoured have sealed my fate and turned me into a monster of endless hunger. And that according to prophecy, I must be stopped, and only he can do it.
Who is he to say such things? Who is he to call me a monster? I've had time to think about his manipulations, about me being abused and in turn to be sacrificed. I figured it all out thanks to my many new perspectives on life and events. Dumbledore is the true monster. If there is yet another prophecy, it must be to stop him once and for all. Just like Voldemorte, he has come to kill me as I am a threat to him.
I roar and cover him in flames. He shields and returns fire with his own spells. But I am a dragon. Powered by thousands of wizards. Enhanced with the properties of hundreds of Dementors. I have studied how to defeat dragons at Hogwarts, and I have the knowledge of those who specialize in using magic to harm others. I am ready for whatever magical he can use against me and I prove it by forcing him on the defensive.
He tries using physical objects but I rip chains from the ground, bash through walls and shrug off spears. In his last moments he casts a pheonix of light, which causes me momentary pain before giving me clarity. My new dementor aura gets pushed back within me and I realize what I've become, and how much I have been influenced by the dementors and possibly the dragon within me.
At this moment I look down at Dumbledore, and I know, it's too late. I recognized how he became the Master of Death during our duel. He came here to end me and he won't back down. He is a master manipulator now in possession of the Deathly Hallows. After seeing what he's done over the years I can't let him live. I am a vessel for dark wizards. Criminals. The worse wizardkind has to offer. I know what I must do.
He barely has time to scream as I chomp down. Taking his soul and the Deathly Hallows with it. For I am the Death Eater, and not even the Master of Death can stop me from my new purpose.
I can feel the Deathly Hallows within me, being consumed and infused with my animagus form just as the dementors were. My mind can now fully command the souls I consume. No more battle of wills. Freeing my mind and allowing it clarity from my dragon and dementor instincts. My wings now channel my family's cloak and conceal me from all detection. And my ability to cast spells has been returned to me as my tail is infused with the Elder Wand, giving me the ability to perform all of my wand movements.
With a newfound purpose, clarity of mind and power, I feel that I am now truly on the right path. The world will call me a monster, a threat to their existence. Evil will use the press and manipulate the sheep as they have done to me for years. But I will not waver. I will control and direct my hunger to those who deserve it most, and I will make a better world from it, even if I must be the villain. For I am the Death Eater now, and I have people to save.