(Pending. The significance of the missing 20th weapon and the erased name is withheld — deeper Imu/Lily/Void-Century lore is forward.)
Earliest known caller
(Unrecorded.)
Why this matters
Negative-space foreshadowing: the meaningful detail is the absence — a weapon that should be there and a name that was scrubbed. Oda plants the hole in the record on-page so the eventual reveal lands as the missing piece. See Void Century and Ancient Kingdom, Imu Identity.