SkyMantle
The SkyMantle (JP: スカイマント) is an unused armor in Chapter 2 of Deltarune that gives +1 DF and the 
Elec/Holy ability. It deflects 50% of the damage made by Elec and Holy attacks, which is referred to as Element 1 in the code.[1] As of Chapter 3, this element is only used by some Zapper attacks. It can be equipped to any party member and cannot be sold.
It is similar to the obtainable Shadow Mantle, both being mantles, only increasing the Defense stat and granting an elemental resistance.
When equipped, this item does not show any flavor text, similarly to the TensionBow.
- ↑ gml_GlobalScript_scr_armorinfo script, lines 410–415, Chapter 2