|“The Yin-Yang promise is a beautiful and sacred tradition, Jay. Congratulations.”|
|— Dareth to Jay in "The Darkness Comes"|
The Yin-Yang Promise is a sacred tradition practiced by the people of Ninjago. A piece of a medallion with one half of the yin-yang symbol is presented to a romantic partner, signifying their promise to be one with each other forever.
Jay proposes his Yin-Yang to Nya.
Jay mentions it when he introduces Nya to Queen Murtessa.
- The Yin-Yang Promise is not the Ninjago equivalent of a marriage proposal. It is a separate love-related custom unique to Ninjago.
- It seems to be equated with betrothal, as when Murtessa asks if Jay is betrothed, Nya says "Yes! He is! To me!"
- However, it is also treated similarly to a marriage proposal, such as in "Into the Breach" when Kai asks Jay "Did you pop the question yet?", which means to propose.
War of the Oni and the Dragons · Light vs. Darkness · Reign of Aspheera · Long Winter · Serpentine War · Battle for All of Time · Attack of the Great Devourer · The Final Battle · Nindroid crisis · Second Serpentine War · Battle of Stiix · Fall of Ninjago · Rise of Ninjago · Oni Invasion · Monastery Siege · Lloyd's Journey · Liberation of the Never-Realm · Attack from Prime Empire · Battle for Shintaro · Conflict on the Island of the Keepers