Within the data for Chapter 4 are two unused prophecy panels pertaining to optional and hidden events in the game's story:

• One panel depicts a series of snowflakes and is accompanied by text reading "COLDWATER FELL FROM THE TOP OF THE SKY." This alludes to Spoiler:the Weird Route, which is instigated in Chapter 2 by using Noelle's IceShock ability to freeze every enemy in Cyber City before learning and using SnowGrave on Berdly.
• The other panel depicts the battle hammer from Spoiler:Gerson's Hammer of Justice guise, with its own text reading "AXE CARVED BY THE TORTOISE'S GRAND HAMMER." This alludes to Spoiler:the battle against Gerson himself as the chapter's secret boss and the JusticeAxe weapon that he grants Susie upon defeat.

Although the hammer panel is never seen as a part of the prophecy, the sprite for it is nonetheless featured among the cavalcade of panels floating in the void at the start of the Third Sanctuary. The snowflake panel is also alluded to in the Winter 2025 edition of the Undertale/Deltarune newsletter, the start of which reads "Cold water falls from the top of the sky."