Shadow

Various concepts in Deltarune are titled with "Shadow":

Shadow Crystal: a Key Item which can be found in every Chapter and given to Seam.
Shadow Crystal boss: an optional boss that holds a Shadow Crystal, and an especially strong adversary in that Chapter.
Shadow Mantle: an armor obtained on the Sword Route in Chapter 3 which is especially useful in the battle against the Knight.
Shadow Mantle holder: the boss holding the Shadow Mantle.
Shadowguy: a regular enemy in Chapter 3.

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