RealAlHazred
Frumious Flumph (Your Grace/Your Eminence)
Ooh, how about:Alternatively, you could have Spirits of the Community--you summon a cloud of guardian spirits using your bonus action. The first time an attack would affect more than one party member, the spirits take the damage for the entire party for that attack. You can't use this ability again until completing a long or short rest. By 17th level, the party should be running into things that have AoE's, and you get 1 get out of jail free card against them.
It seemed slightly more potent than a regular level 17 effect, so it seemed appropriate to make it a channel divinity power and use up some resources.Channel Divinity: Spirits of the Community
Starting at 17th level, you can use your action to summon a host of community spirits that last for 10 minutes or until you use your action to dismiss them. The spirits surround you to a 30-foot radius. You are aware of all creatures in that area, and creatures within that area receive no benefit from being hidden from you.
Alternatively, when any creature or creatures within that area take damage from a weapon or a magical effect, you can end the effect early to cancel the damage to all affected creatures.