Abandominium Creeper

Note that this does not exist in Minecraft; it was written purely as a fiction article.

Abandominium Creepers are a common hybrid found occasionaly in dark houses or buildings. They do not interact with other mobs. They tend to cluster together in mass groups and make noises similar to Ghasts. They were born when a Ghost Creeper and a City Creeper came together.

Behavior
Abandominium Creepers float around leaving behind grey particles where they've been and will gain altitude when approached. Because they are part ghost, they can go through walls and mobs. They have a faint outline and are hard to see. They only come out at night and can be heard from about 40 blocks away.

Habitat
Abandominium Creepers are found in Abandoned Mineshafts, Dungeons, and dark player-made structures as long as it has a light level of 7 or less. Putting a torch in these areas will prevent them from spawning.