Rus Mastery 8/15 Divinity

How do you get past the Divinity Mastery. Defeat 30 enemy units affected by Saints Blessing?

U have a unique Monk which also is a Kav unit and can attack. When he charges into battle, he will buff units around him quite generous range, too. Try going full knights vs Ai with a few monks and just charge his army down. Also make sure u have all Upgrades from the monestary