Ninjago: Dragons Rising - Season 2

A mission in the Land of Madness to find his parents leads Arin to a gravely wounded Matriarch of the Mountain Dragons. When Riyu???s tribe mother falls to her injuries, the Ninja race her offspring back to the nest and encounter an old foe. The Ninja must solve the Matriarch???s murder and accept a new mission from the Source Dragon of Motion to determine who stole the Matriarch???s horns ??? and why.