LEGO NinjaGo: Masters of Spinjitzu - Season 5 Episode 7 -

The Ninja now have all the items they need to get to the tomb of the First Spinjitzu Master but before they can figure out the last riddle that leads to the location of the tomb, Ronin steals the sword to give to Moro in exchange for his soul, and the Ninja and Nya are unable to stop him.