Mangetsu (Zanpakutō Spirit)

Mangetsu (満月, Literally Meaning; "Full Moon", Viz. "Spirit of the Full Moon") is the manifested spirit of Toneri Tokugawa's and reflection of his very own Hitorigami and Dragon lineage. Mangetsu was feared throughout the entire Takamagahara, and gained a name for itself in the Soul Society as well.

Power & Abilities
The Father of the Hitorigami himself as stated the Mangetsu's reiatsu is the strongest in the history of Zanpakutō in Takamagahara.