2. A particularly hellish boss character from Castlevania: SOTN having this name; it can best be described as a giant floating sphere of undead corpses. Known in the Japanese game, and in several game boy spinoffs, as Legion.
If you wish to study a granfalloon, just remove the skin of a toy balloon. - Book of Bokonon
2. Aak! It's the Granfalloon! Oh well, Alucard can pwn anything, anyhow.
The granfalloon attacks you by dropping out and animating a bunch of its corpses that in turn attack you like zombies. You need to keep hacking and slashing at the zombies to defend yourself. To kill the granfalloon itself, you need to keep jumping and using your weapons to break apart the ball of corpses. Once the central body is exposed however, things get harder when the granfaloon uses its many tentacles to shoot out laser-like beams in all directions around the room. You have to dodge the laser beams and keep trying to hit the central body, until you finally destroy the monster altogether.
The granfalloon can be found in the Catacombs, which is the lowest level of Dracula's castle.