Premonition Dreams

Premonition Dreams are dreams that reveal a future event to the dreamer. Their contents vary widely, but each contains Lumus. Croak dreams, a subset of premonition dreams, reveal how the dreamer may die. The dream may not be literal and is open to interpretation but will eventually happen.

In "The Dream", Bubbles has a croak dream about a goopy monster and another person in a void, and got stabbed by the other person. At the end of said dream, Lumus appears and wakes Bubbles up, which she claims confirms it was a croak dream. It is unknown whether one can cheat fate by avoiding a croak dream's circumstances, but Bubbles says it is impossible.

It does seem possible, however, for one to indefinitely postpone one's fate, as Buttercup's presence postponed Bubbles's, since at the end of the episode, she states that the events in her dream will happen again when Buttercup isn't around. They eventually did in "The Void," however, it was revealed that the dream was not actually predicting her death, but was instead foreshadowing Nightmare saving Bubbles's life from getting lost to corruption.