The Forgotten Ones

The Forgotten Ones are truly leviathan-sized monstrosities that dwell between the barriers of the known dimensions of the Alterverse. Encountered by Adepts of the Order of Watchmen, they are damn near impossible to kill by most conventional means. Thankfully, they cannot exist within any dimension except as a smaller "spawn" of their parent-sized selves.
Believed to be the real life inspiration for H.P Lovecraft's Cthulhu mythology, the Forgotten Ones often take monstrous forms of chaos and darkness when invading our world. Tentacles, multiple-eyes, scaly skin, gawping maws of impossible proportion... things get pretty weird when facing the Forgotten.
To make matters worse, many groups of Occultists often form worship cults centered around specific, known Forgotten Ones. So when one of these primordial baddies decides to manifest in our realm, they may have a small band of well-armed human groupies ready to take up arms in their defense. 
== Facts: ==
-Some Philosophers have claimed to witness titanic battles between the dimensional barriers between the Forgotten Ones and what appears to be Adepts of unknown origin. Many have speculated that they are Adepts of an as yet uncontacted dimension, possibly of an unknown Order! The Creators secretly believe they may be members of their own Order who have reached Ascension (the Destroyers believe something similar of their own Order).
-Forgotten Ones are not truly alive, at least not in the way we think of true sentience. They are manifestations of the primordial energies of creation, developed into forms of near-sentience. They often break through into or world by using sentient beings suffer extreme dementia (another words, madmen) as portals or gateways through which they can bypass the dimensional barriers.
-The Forgotten Ones are the sworn enemies of the Philosopher Adepts. The Philosophers, whose minds can explore all of existence, are often hunted by the Forgotten on a purely psychic level. Many Philosophers find themselves 'haunted' by Forgotten Ones in order to drive them mad and turn them into mega-portals, gateways large enough to fit huge Forgotten through into an unsuspecting world.
-They are called the Forgotten Ones because, when encountered by regular people, the sight of these elder monstrosities causes people to suffer madness or delirium and forget the experience.