B.A.C.C.D.A.

B.A.C.C.D.A. (or Blimp of Absolute Cataclysm Cursed by Dark Arts) is a MOAB-class bloon. It appears as a boss in Boss Fight (B.A.C.C.D.A.) and nowhere else.

Stats
HP: 777,777

RBE: 777,777

Speed: 0.1 BPS

Backstory
Voldemort has crossed over worlds into the world of the Bloons, where Bloons are the overwhelming evil, and the monkeys were born grudged and secluded. Not satisfied with the brute force evil the Bloons are using, he put Apopolypse Bloon under Imperio and took the job from him. During his short career, he created the B.A.C.C.D.A., before Apopolypse Bloon broke the curse controlling him with his insurmountable rage and chased him out of the Bloons universe. He still keeps the B.A.C.C.D.A. as a secret weapon, and as a magic school for Bloon designers.

Mechanics
You start with $350,000. You gain $3 for every hit you deal to B.A.C.C.D.A.. Wizards are 10% cheaper. Normal rounds run in the background, similar to Apopolypse. Mission ends when B.A.C.C.D.A. is defeated.

Special abilities
Portus: B.A.C.C.D.A. teleports forwards by 5 Bloon Diameters.

Sectumsempra: 3 towers are damaged at the same time. Damage=50

Avada Kedavra: One tower is instantly killed.

Stupefy: All towers are stunned for 7 seconds.

Horcrux: A tower becomes a horcrux, and it starts emitting green sparks. Unless the horcrux is killed, B.A.C.C.D.A. cannot take damage. Horcruxes sell for $0.

Imperio: A tower starts attacking other towers. It won't stop until it is destroyed or sold. Imperio towers sell for $0.

Accio: A third of your money is stolen by B.A.C.C.D.A..

Gemimio: Makes a copy of itself that has no special abilities and has only 77,777 HP.

Impedimenta: The first three towers that attack it have reduced 50% firing rate permanently.

Mutatio Skullus: Turns the strongest bloon in the background into a ZOMG.

Acknowledges
So if you really haven't realised this is all from Harry Potter. I know everything's a little tacky and all. Report any exploits or OP-ness, or comment any fun strategies.