What has...
No backbone so that it can fit into just about any space.
When threatened, it changes color in order to blend with surroundings.
Uses a smoke screen to escape from any who would confront it.
Has many arms and if one gets removed,it just grows back.
Loves to squeeze the enemy and paralyze them before ending their life.
Has been know to turn on it's own kind.
Is poisonous in all of it's different species.
Has been known to build walls around it to hide it's true intentions.
Though these are some traits of the octopus, I truly wish that was what I was describing here. To my dismay, I am describing something much more hideous, more treacherous, more cunning, more poisonous than any sea creature from down below. What is it I am describing, you ask...