community.wizards.com/go/thread/view/758...
Defender is nice ability.
Defender: While you are using a shield, when a creature within 5 feet of you is attacked, as a reaction you can give the attacker disadvantage on the attack.
Reactions: Some actions allow you to act when it isn't your turn, usually in response to a trigger... When you take a reaction, you can't take another one until the start of your next turn. Also, any effect that denies you the ability to take actions also prohibits you from taking a reaction.
As a Knight, the Cleric of Moradin is going to be on the front line attacking with the Fighter (or the Rogue) and each round, as a reaction, he can make the monsters roll twice and take the lower result on an ally. This promotes team play and staying close to the cleric.
Two PCs with the Defender ability, using it on each other might resemble phalanx soldiers.
eleusis
