How do I get started?
First of all, to begin the quest for Benediction you need to find a raid group that is capable of killing Marjodomo Executus, get him to drop Eye of Divinity, and most importantly, make sure you're the lucky priest that gets your hands on it!
Eris Havenfire
When you have acquired the Eye of Divinity you have to make a trip to Eastern Plaguelands and seek out Eris Havenfire.
Note that you can only see Eris Havenfire when you have the Eye of Divinity equipped.
She is located at the yellow dot:

Eris Havenfire is not like most NPCs however, she doesn't stick around indefinitely.
If any priest has attempted her quest "The Balance of Light and Shadow" and Failed, she will despawn for 2 hours. Yes you heard that right, 2 HOURS, so don't be alarmed if you can't see her with your trinket equipped, you'll just have to wait.
However, there is a way to avoid her to despawn if you feel overwhelmed during the quest, which brings us to "The Cleaner".
The Cleaner
Yes, the quest giver de-spawning for 2 hours isn't the only annoying thing about this quest. If ANYONE enters the quest zone while somebody is attempting the quest the quest will be interrupted and "The Cleaner" will show up to "clean" everybody up. This usually ends in 2 dead priests.
The bad thing about this mechanic is that if other priests arent aware that you are on the quest, they might log in / go to the quest giver to start the quest themselves only to see that you were in the middle of the quest and have now interrupted it as a big bad demons is now on its way to kill you both.
The good thing about this mechanic is that he interrupts the quest.
This means that if you are about to fail the quest, have a friend stand outside the quest area and tell them to run in, this will interrupt the quest instead of failing it and Eris Havenfire will NOT despawn.
This brings us to the quest.
The Balance of Light and Shadow
The quest is pretty straight forward: "Save 50 Peasants before 15 are slain."
But there's a lot more too it than that.
As soon as you start the quest untargetable skeletal archers will spawn on the hills north of the quest giver, these will shoot at the peasants that should also have spawned further up the road. Your objective is to get the waves of peasants to the beacon of light.
You will have to escort the peasants to their destination, healing them to prevent them from dying.
The Peasants will also periodically receive a disease that ticks for a fair amount of damage, you will have to dispel it with abolish disease.
A good tip is to have friendly nameplates activated so that you can see what peasants require your aid.
There will also be weak skeletons spawning that wants nothing else than to mess up your quest progress. They are very weak and have about 100 health, but will attack you and the peasants. You can use a low rank of holy nova to clear them.
If 15 of your Peasants die, you fail the quest and the questgiver will despawn for 2 hours.
Remember, you can always cancel the quest by having someone interrupt it by activating The Cleaner so the quest giver never has to despawn.
If 50 of your peasants survive, you will complete the quest, the quest giver will do an emote/yell then just go talk to her to recieve your reward: Splinter of Nordrassil
You can use this to craft your very own Benediction, and you already have half of the components!
All you need now is the The Eye of Shadow.
The Eye of Shadow
You can get this item by either getting your raid group together to kill Lord Kazzak, buying it off the auction house, or farm high level demons in one of these zones:
Winterspring if you have a small group:

or Blasted Lands if you have a larger group:

Helpful Consumables:

For Killing Scourge Footsoldiers, 1 minute cooldown.

For Killing Scourge Footsoldiers, no cooldown.

For restoring Mana.


For restoring mana. Shares cooldown with each other but not with Major Mana Potion.