The City Inevitable
A slang term among long-lived citizens of Gateheart. A mayfly catcher is an individual, typically immortal but also of a race that has an especially long lifespan, such as a danan or a sidhe, that specifically seeks out romantic relationships with shorter-lived beings such as humans. However, in regards to true immortals, this term takes on a different meaning. For an immortal to call themselves a mayfly catcher could possibly mean they tend to be romantically attracted to any individual capable of true death. However, for individuals using the term that are not true immortals, this usually means that they date only humans and other beings of similar lifespans.
Interestingly, individuals that date thri-kreen and other insectoid races never use the term, because the racist overtones it gains in that context.