So the scourge have arrived and you wanna make the most of it, right? Well look no further!
First, you'll see that your cities have gotten some new NPCs.
First we got the Argent Dawn Recruiter who'll give you a simple quest where you have to go to the Light's Chapel in Easter Plaguelands.
Then we got the Argent Dawn Initiates, who'll offer you a stamina buff that increasing depending on your level. These start as Lesser Marks(10 stamina at lvl 60), and turn into Normal Marks(20 stamina at lvl 60) and later Greater Marks(30 stamina at lvl 60) depending on how many scourge invasions the server has fought back.
Last we have the Argent Dawn Messenger, who'll tell you exactly where the current Scourge Invasions are taking place (which can also be seen on the world map in form of a purple skull), how many Necropolises are left and how many Scourge Invasions the server has repelled.
Eastern Plaguelands NPCs and Quests
When you arrive in Eastern Plaguelands you're met with some new NPCs too, mostly copy pasted from city NPCs but there are some unique ones.
First there is the Commander Thomas Helleran. This guy will start your main quest chain:
Under the Shadow into Shadows of Doom (This is an elite quest so it CANNOT be done in a raid, you have to do it in a 5 man group max!)
Doing this quest chain will unlock the Argent Quartermaster who you can then buy various item from with Necrotic Runes.
The Scourge Spawns at the areas also have a chance to drop quest letter that each give 25 rep upon hand-in at Light's Chapel.
Event and Rewards
So when an invasion starts, a Necrotic Shard will spawn in some of these locations:
The Shard starts at 100% health and spawns numerous high level scourge around it, which all can drop the Necrotic Runes. There is also a rare chance to spawn a rare scourge, that is guaranteed to drop a bracer of scourge slaying (more on that later)
When the shard reaches 0% after a lot of killing, 4 Cultist Engineers will spawn. If you go to one of these, you can interrupt their ritual and summon a Shadow of Doom
At each shard a max of 4 Shadows of Doom can be spawned. These guys have around 120-140k health and do moderate damage. They also frequently fear and life drain but that can be dispelled. Their main ability is a 1 shot ability that you cannot avoid (except maybe invul abilities). It's called Scourge Strike and the Shadow of Doom will hit it's main aggro enemy with it after a few minutes of combat. These bosses, along with being needed for the Shadows of Doom quest, also drop 30 Necrotic Runes, a Corruptor's Scourgestone (if you got trinket) and a chance at the scourge slaying chest piece.
When the 4 Shadows of Doom have been killed the Shard respawns and you can do the event again, but a Necropolis only has 2 shards so after the 2nd has been downed, the invasion in that spot has been repelled and you'll have to find a new area in the zone or wait for the next invasion to begin.
As for the special armor that can drop, the Shadows of Doom have a chance to drop:
Robe of Undead Cleansing (Cloth)
Tunic of Undead Slaying (Leather)
Chestguard of Undead Slaying (Mail)
Breastplate of Undead Slaying (Plate)
The rare scourge bosses that sometimes spawn have a chance to drop:
Bracers of Undead Cleansing (Cloth)
Wristwraps of Undead Slaying (Leather)
Wristguards of Undead Slaying (Mail)
Bracers of Undead Slaying (Plate)
These are a part of a 3-set, where the gloves of this set are bought from the Outfitter/Quartermaster for 30 Necrotic Runes.
As for the Argent Dawn Quartermaster, he begins to sell you a lot of nice stuff when you complete the Quest chain
15 Necrotic runes for a Major Healing/Mana Potion
30 Necrotic Runes for Scourge Slaying Gloves
8 Necrotic Runes for a Consecrated Sharpening Stone or Blessed Wizard Oil (You can apply these through Trade windows)
10 Necrotic Runes for the Tabard of the Argent Dawn
Special Dungeon Bosses
During the Invasion, you'll also be able to encounter 6 different dungeon bosses:
Lord Blackwood in Scholomance
Balzaphon in Stratholme
Revanchion in Dire Maul West
Lady Falther'ess in Razorfen Downs
Scorn in Scarlet Monestary Graveyard after last boss is killed
Sever in Shadowfang Keep