Inner Potential:: Later learns that all excess is poison
[Formless Poison]: Striding away from 相手's attacks, 自分 effortlessly sneaks in poison into 相手's essence as 相手's very soul becomes poison & their body a prison, devouring them from the inside out.
"Poison is excess...": In the final clash, 自分 realizes the truth & zenith of poisons as he begins creating a new toxin—Wisdom itself, coating his sword in excessive wisdom & piercing 相手's defences