W. D. Gaster was the Royal Scientist before Alphys, and was stated to have irreplaceable brilliance.[1] Gaster's Followers imply that he created the CORE[2] and has disappeared. During normal gameplay, W. D. Gaster is typically unmentioned. Despite this, River Person, rare Fun Value events, and certain Inaccessible Rooms hint at his existence. This includes Room 264, named room_gaster.
In particular, Gaster's Followers relay Gaster's implied fate. One iteration says that he "fell into his crea
