The Maelstrom Essence is the very core and spirit of the Maelstrom itself and is fully competent and sentient. Its location is unknown, but it is believed to be in some sort of subspacial layer (not the Time Rift). The essence of anything infected enough is added to this entity, who controls all maelstrom enemies. It is the hardest enemy in the game, and can only be fought upon going to all worlds and (possibly) completing all Faction Missions, though GMs can face it anytime. GMs could also possibly face a more powerful version, just for fun. It may be faced in The Core, a post release world.