The 27

The 27 is the biggest threat to the elemental islands.

It is made up of 27 elements: Fire, Magma, Ice, Sea, Oceanic, Tide, Blue fire, Sound, Mind, Ghost, Plant, Animal, Electricity, Metal, Plain, Space, Time, Gravity, Air, Light, Darkness, Radioactive, Unknown, Sand, Earth, Power and Shapeshifting

The unknown element inside it allows it to destroy entire planets at the cost of some of its sanity. It wants to become the ruler of the elemental islands but has never gotten that far... yet.

He has battled most of the other elemental warriors.

It has died twice and is currently dead.

Zeta became the 27 by collecting all the elemental stones.