A failed experiment by ansem, this particular heartless was so powerful and uncontrolable that ansem had little choice but to imprison the creature in one of the many doors to darkness, however aruvhan had unlocked the door and is somehow able to control the beast. Zeiram carries out all of aurvhan's commands, but is it out of gratitude or is it simply waiting for the right moment to turn on him?
Zeiram is the one responsible for destroying kei's world.

This version of zeiram can use many attack spells such as blizzarga, firarga etc.

It can also create and control swarms of heartless as well as create special heartless call dark guards.

and finally his skin is impervious to all weapons and magic attacks.(with the keyblade being a notable exception)