Getting all our ducks in a row about dark worlds
Information that has been shown to be true
the roaring knight, kris, and susie can create dark fountains
the dark worlds are a parallel universe to the light worlds
dark worlds created by different lightners in the same area are different from each other
the castle town is the only dark world that can house every single darkner
darkners that enter other dark worlds that aren't their own turn to stone
any food eaten in a dark world won't carry over to the light world
any injury sustained in a dark world WILL carry over into the light world
a second dark fountain opened in a dark world will spawn a titan instead of another dark world
the dark shard is the only item from the dark world that doesn't get converted into a light world equivalent
Information that has been stated to be true by a character but hasn't been explicitly shown to be true
"no one can choose who they are in this world"
the castle town dark fountain is a "grand fountain" that can house any darkner due to being made of pure darkness
asriel and ralsei look different
all lightners can create a dark world
ONLY lightners can create a dark world
a dark world can't be reopened once closed, any attempts to reopen a previous dark world will just make a different version of the previous dark world
darkners are not inherently malicious, they only become malicious via outside interference
the entirety of the prophecy (tenna surviving despite the prophecy saying he would be "cleaved red by blade" means either the prophecy can be bent OR as long as the conditions of the prophecy are fulfilled the end result can change)
Information that ended up being false
ralsei's belief that pacisifism can be used to be spare all enemies
the roles (rpg classes in the dark world) assigned to lightners are fixed (in the specific case of susie going from the bruiser to mulitclassing as a competent healer)
jevil and spamton were contacted by the same entity
jevil, spamton, and all other secret bosses have knowledge of the prophecy and/or nature of their existence that other darkners do not
darkness type enemies (titans, titan spawns, and the roaring knight) can't be spared
weaker darkness type enemies can be "purified"
titans are created from something darker than pure darkness
tp is directly correlated to light
darkners that enter other dark worlds that aren't their own won't turn to stone if they fit in with said world (the pippins in the tv world)
more than one dark world can be open at a time (if the bunker is a dark world)
dark worlds can be used to reanimate dead lightners
susie is not "the girl" mentioned in the prophecy