Classification: aberrant macrocosmic construct (the Dark Tower), macrocosmic animus (true form), "creator god".
Colloquial name: Gan, the Other, the Rose, the White, the Talisman.
Origins: Gan formed or awoke in the protocosmic realm-state known as the Prim, in an event roughly analogous to a human rising from water. Wishing to create but knowing a single realm could not hold all of his ideas, Gan divided existence into a macrocosm dominated by his incarnate form, which appears as a tower with infinite levels. He likely appointed the Guardians of the Tower's Beams (discussions with Maturin still ongoing).
Description: Gan's avatar appears as a tower, dark in colour, with an infinity of floors and seemingly endless chambers. Each floor transcends the one below, similar to the layers of our multiverse. Analysis suggests that "smaller" realities are contained within small elements of "larger" ones, such as the equivalent of sand grains. There appears to be something similar to a chamber at the peak of the Dark Tower, where either a more responsive avatar of Gan dwells, or his true form can be contacted. Gan himself is formless and dimensionless.
Behaviour: the Dark Tower does not act, but it seems obvious that Gan uses it as the equivalent of a sensory organ or sensor: it is, after all, part of him. Gan appears to be a benevolent but aloof entity, even more so than Maturin. The force known as ka, or fate, is an aspect of Gan, suggesting micromanagement of his macrocosm. However, Gan has been known to aid those who take a stand against evil (see: the interference of the Other in the Deadlights incident). He is constantly engaged in a game of cosmic chess against the Crimson King, his equal and opposite, with order and chaos being expressions of their struggle.
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Asset level: macrocosmic. The Dark Tower is equal in stature and complexity to our infinitely-dimensional multiverse, and beings who transcend it are described as being akin to motes in Gan's mind. Gan can control and manifest all aspects of the macrocosm.
Collaboration: while Gan has not responded directly to the Collective's attempts at communication, his observed tendencies suggests he is willing to stand besides those who seek to make the world a better place; or, to employ a human saying, he helps those who help themselves. Intervening against the Crimson King on his behalf has been suggested, but is still being discussed; experiments on whether Gan's macrocosm can maintain spontaneity and other beneficial forms of chaos without Dis' existence (that is, if the two can be separated) are still ongoing.
Neutralisation: Gan exists on a level of dimensionless existence transcending that of the Deadlights and Turtle, or (as Gan is yet to exhibit greater power than this) akin to a Voidmaw of the first Twilight Void. Quantum entanglement with such aberrants and devices employed to annihilate them should prove sufficient, should Gan turn hostile.