The Xen creature is an extinct creature. The creature was formerly an animal, then it mutated. The creature then split to five different classes, each one more dangerous than the last: (Passive, Not Dangerous, Neutral, Dangerous and World end)
NORMAL CREATURES
Head Crab
A crab was mutated to form the Head Crab. It always attacks the victim's head, then replaces the head with itself and then gains control of the body. (Dangerous)
Snark
A insect, presumably a ladybug, was mutated to form the Snark. The creature is passive and can be petted. (Passive)
Bullsquid
The creature is a bull with a squid tentacle head with red flesh skin. (Dangerous)
Houndeye
A dog was mutated to form the Houndeye. It has only half of its body remaining. It can not even see (Neutral).
Vortigaunt
A Robloxian was mutated to form the Vortigaunt, a humanoid like creature. It has a third hand in chest and is bug headed. (Dangerous)
Antlion
It is unknown what species was mutated to form the Antlion, but it is known to have a big mouth. (Dangerous)
RARE CREATURES