Japanese Skill Name: 毒
Transliteration: The furigana tells us to read it as 'Poison.'
Description: All we know is that when Shin met Yuzuha, Poison X was already on Yuzuha, together with Curse X. Based on the fact that Yuzuha's HP was in the red zone at that time, we can assume that this skill grants a debuff that deals damage over time.
First Appearance: When Shin finds Yuzuha in Volume 1 Chapter 4.