The Appearance: This deer should be a manifestation of your character's "essence" aka their soul/personality/etc. The deer can look like anything so long as their core structure is that of a deer. If a character undergoes a personal change within the game their deer shape may change but all in all, the appearance of the deer should remain fairly consistent.

Psychologically: Characters in deer form will be a much calmer, simpler version of themselves. A deer will act as the foundation of a character's core personality - whether that's good or bad. Despite good or bad traits, all characters in deer form will feel an unusually strong urge to help Sleepers in need. For bad/evil characters, this might mean they transform into a particularly violent deer that's more suited to fighting off threats than a good character who might be more suited to providing comfort to a Sleeper.

Characters will feel a disconnect from their normal psyche though they will be distantly aware of it existing and distantly aware that this is not their regular body. The longer they spend in their deer form, the more distant they will feel, and if they are in their deer form long enough, they may completely forget that they were ever a Sleeper to begin with. This can happen as quickly or as long as you prefer.

Characters who have forgotten about being a Sleeper can be summoned back to themselves by other characters going out of their way to do so - accidentally or intentionally.

Communication: Sleepers in the form of deer will be able to communicate with other deer clearly through telepathic communication. They may be able to telepathically communicate with some regular Sleepers though it should not be as clear as regular communication. Maybe they can only communicate to Sleepers in riddles or in a certain language or through mental images instead of words. You choose.

Locations: Most deer will be drawn to certain locations that the character is usually associated with - or maybe where the character wishes they were associated with.

The Aura: These deer have a specific aura they give off that is reminiscent of the character. Maybe they smell like the character or maybe a song plays around them as they trot around as a deer. This aura should be more consistent than the deer's physical appearance as it will be the most identifiable part of the deer.

Summoning/Manifestation: To transform into this form, a simple blood ritual can be done with the intention of transforming, but you can go as simple or fancy as you like. Other characters can summon specific deer to areas by intentionally or unintentionally "summoning" them. This can be done in any way you feel makes sense with your character. Maybe someone must light a specific colored candle to summon your character's deer. This can also be used to bring a character back mentally.

Abilities: Every deer has a minor ability associated with the character. This should have to do with the character's personality/history rather than any canonical abilities they have. You can always choose to go with some canonical ability, but this is meant to provide an interesting opportunity for players to translate character personalities into a symbolic ability. Maybe a deer can provide minor healing or maybe it can breathe fire. The ability should be relatively simple. It can be connected to the deer's appearance or not.

Within Deer Country, all Sleepers will not be susceptible to Corruption or Beasthood whilst in this form. They will also ease Corruption in other Sleepers they are around them.

Summonings: If a character has been lost mentally to being a deer, another character can "summon" them to a location with specific items. They can then proceed to verbally remind the deer/character of who they are, and this should be performed in an IC scenario. Eventually, it will awaken the character and the character will reappear in the Seventh Door.

Intentionally: Characters who do not let themselves stay a deer for too long can mentally choose to "go back" and they will feel themselves teleport right back to the Seventh Door. Back in the Seventh Door, Ramona will be asleep again. She cannot be woken up at this point no matter what you do - and the character will feel exhausted themselves. They will be able to leave out the door they came in. This will bring them straight back to Trench.

In the world of Trench, people can witness characters transform from a deer to a Sleeper (or vice versa) through their bodies bursting into purple dust and reorienting to that shape.