Memory of Two Worlds
Changelings are Álfir that, at birth have undergone a ritual which cause their Glamour to manifest as physical adaptations that forces them to adjust to their surrounding environment, taking on the appearance and characteristics of those they surround themselves with. Changelings are swapped with human’s at birth for several purposes, most of the reasons are unknown to most common Álfir. Furthermore what the Álfir do with the human children is unknown to all but a few, but their fates are generally not speculated to be good ones.
Changelings are largely ignorant of their true heritage until they are either “activated” but the Álfir to serve a specific purpose or they are brought back to Fál.