The Earth Dimension

~There isn't much to cover with this one. Everything is more or less the same, with the exception of certain changes in geography and history such as the town of Oakside existing in Alberta, Canada or the fact that the Slenderverse YouTube channels and videos don't exist(despite most of the events shown within them still happening).

The Crawlspace and The Candleverse

~The Crawlspace exists beyond the boundaries of time and space, constantly warping and shifting to serve Slender Man and The Collective's needs. The place can be whatever they want it to be, do whatever they want it to do, and it answers only to them. It's their domain, which is why they have almost absolute control over the place but limited power in other dimensions.

~The Crawlspace is essentially an interdimensional tunnel between Earth and another dimension, which is where its title of "Crawlspace" originated from. It is not yet known what the other dimension is.

~Time works differently in this dimension; Minutes are hours, hours are days, days are weeks, weeks are months, months are years, and so on.

~Since this dimension isn't bound by mortal logic, the flow of time can move in any way, including backward.

~A purgatory-like abyss called The Library exists in The Crawlspace. It is where the tortured souls of Slender Man's victims are sent.

~The Candleverse is simply a major section of The Crawlspace that was taken over by Habit to serve his own purposes. He has full control of this sub-realm and allows Firebrand to operate within it.

~While electricity is present within The Candleverse, it still possesses The Crawlspace's tendency to snuff out excess light. To get around this, candles are used in place of electric lights, as fire does a much better job of cutting through the darkness. This is where the realm's name originated from.

~The Candleverse is home to a number of strange creatures, including the pale, lanky, humanoid entities that lack features beyond a giant eye that takes up most of their face. Habit often uses these beings as butlers/servants, assigning them menial tasks and occasionally naming them.

The Dark Realm

~Little is known about this ominous plane of reality. At the time of writing, it has only been mentioned once by Firebrand and Habit. It can be assumed that it carries some deal of importance.

~It's speculated that this may be what lies beyond The Crawlspace.

~Hellfire originates from this dimension, a supernatural flame that Firebrand stole and learned to use to his advantage during the first timeline reset. It's said that Hellfire burns your very soul, and wounds sustained from it will never truly heal under normal circumstances. If left unchecked, it could spread far enough to leave a trail of destruction that rivals nuclear warheads. There is almost nothing that it can't harm.

Sub-Dimensions

The Library

~A pocket of The Crawlspace resembling a massive home library where the tortured souls of Slender Man's victims are stored. His plans for these souls are not yet known, but he possesses a collection of thousands.

~Souls can't be sent to The Library unless a victim is killed by Slender Man or one of his proxies, regardless of whether the person was marked as a victim or not. This rule applies to a variety of things, such as murders, car crashes, and suicides. For example, people who died by their own hands like Carl Ross and Charles Matheson Sr. are truly free from their torment, as The Slender Man has no claim over their souls and typically sees no point in resurrecting spiritless husks.