Here's his bio.
OCCUPATION: Jacking masks.
TITLE(s): Methanus Stilean, The fog, Spike, The Pyro.
ELEMENT(s): Every kind of gas.
WEAPONS: Dronal jaw, gas canisters, toxic silver sword, gold sharp tail.
MOC STATUS: Assembled until the end of time.
STORY: When Blackwing landed on the shores of Mata Nui, Ehlek emerged from the waters and tryed to kill Blackwing. He held out his hands to stop him but caught his mask and watched as Ehlek transformed into Stilean.