Get unique Ninja hero cards and yellow gems in the new Shadow Squad story event

While trekking through the Elven Forest, our squad encountered a strange shadow. It was a ninja, a scout for the Shadow Squad. The warrior explained that their community was located in the Southern Forests. As soon as they learned of the approaching evil, they immediately assembled a squad and prepared to defend their borders. We must go to them and enlist their support in the great war. In this event we can get cards of Ninja and yellow gems.