Either or

is a pet only available to patrons that consists of two halves:, and. They are parallel versions of the player that are slightly different. Visually, they take on the tile of the player character. If the player levels up, they will also level up regardless of how much experience that actually have. This has no meaningful effect because they are intangible and are unable to fight in battle or be damaged. only affect the world when one of them achieves what is known in code as "chirality".

When spoken to, they speak of your previous accomplishments in their respective color with the font replaced with symbols not unlike extradimensional hunters. These accomplishments do not include visiting the starting village and turning in books to Sheba Hagadias, Librarian of the Stilt. If the player not accomplished anything yet, they say "You've done nothing".

For technical reasons, this page title cannot include the slash. Both the names of and  are more commonly colored compared to standard wiki guidelines to distinguish them between the normal usage of the words either and or.

Chirality
Adding accomplishments to the journal (excluding discovering the starting village or turning in books) or even leveling up will cause both of them to flicker. They will start to randomly wander around independently of the player for 8-20 turns. After these turns are up, one of 11 random effects will occur, each with equal probability. This effect is seeded from the total number of turns taken in game. Note that in every effect, the activated pet will disappear in a harmless puff of smoke for the zone. If the player character changes zones, they will respawn. If both are affected, they both will disappear.

Whoever triggers the effect depends on the current number of total game turns taken. If the total amount of turns is odd, it will be. if the amount of turns is even, it will be. If there is only one of them in the zone, it will always be the one remaining.

Possible Effects
Some effects only affects either or, and some requires both. If an effect is chosen and there is only one of them when the effect requires a pair, nothing will happen and they will not disappear.

Not as a Pet
is the only pet that is capable of appearing in games that do not have either / or chosen as the starting pet. as long as the mod is loaded, every dynamic encounter has a chance of spawning or  by themselves. They cannot be beguiled or proselytized.

Because they did not start as a pet and thus a follower to the player, they will have their default humanoid faction feelings and will be hostile. However, they are still intangible and cannot actually hurt the player in any way. They will still trigger chirality as normal if the player accomplishes something or levels up on the same screen as them. Since usually only one will spawn, the effects that require both will have no effect.

Trivia
Chirality is defined as an object that can only look like its mirrored form if mirrored, and not through rotation and translation.

either / or's chirality only happens when an accomplishment is done, and the both of them also mention the player's accomplishments when spoken to. This could mean that one or both has also accomplished the same thing, simulating a mirrored image of the player at that moment.