They wander like specters on the fringes of the Dreamscape, carefully concealing their emotions and avoiding memories that smell sour or bitter.
There are two words worth mentioning in this sentence.
1.specter
common meaning: sth unpleasant that people are afraid might happen in the future
uncommon ones: a ghost
2.fringe
common meaning: the front part of sb’s hair that is cut so that it hangs over their
uncommon meaning: the outer edge of an area or a group
and the name "Albedo" is also a stage of alchemy. (It is also "Bai E" in Chinese)