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Comment by Weriik

I found that killing Slagmaw Nibblers is a fast way to proc an invasion. They are very numerous in the lava pools where the goren eggs are in Magnarok.

Comment by Sergijus

Garrison Invasions are challenges in your Garrison that allow you to defeat attacking enemies for rewards.
They can be completed solo but you are encouraged to bring your friends because the rewards are greater if you perform better.
Your first invasion comes early on Shadowmoon Valley and Frostfire Ridge with a Tier 2 Garrison--midway through questing, a player's Garrison will be attacked either by a Thunderlord or Shadowmoon force. This is not available with a Tier 3 Garrison but it is also not considered a "real" invasion.

There are 6 types of invasion:
Ogre
Shadow Concul
Shadowmoon
Botani
Goren
Iron Horde

HOW TO TRIGGER AN INVASION
When you kill level 100 mobs (in the areas for Apexis Crystal Quests), you have a chance that the enemies will prepare to attack your garrison in retaliation. At this point, your commander by the Town Hall will have a quest for you.

In order to trigger an invasion, you will need to kill mobs at following locations:
http://i.imgur.com/RVKLBzR.jpg

Note that you need to kill approx 500 mobs, and you can not be in the raid group. Party is allowed.
Once you kill enough of them, you will get notification at your minimap, where you can see mission status. There will also be big yellow exclamation mark there, pretty easy to spot. Once you spot it, head back to your garrison and you will be able to take quest from Sergeant Crowler (A) or Sergeant Grimjaw (H).

Invasion Stages
The invasion has the following stages:
Invasion - Follow the sergeant
Assault - defeat the assault.
The holdout - endure the assault. This part is timed for ~8 minutes.
The calm - go to the town center
Final stage - kill a boss

During the assault, multiple enemy packs spawn in your Garrison.The following unusual things can happen as well:
The enemy assaults a Garrison building—attack them to interrupt the cast.
A terrified townsfolk runs out of safety. They are marked with a green arrow over their head and you run up to them to move them away.
An infiltrator from the opposite faction is in your Garrison. These have a hefty bit of HP.

Invasion Points
During the invasion, you gain points via the following ways:
Killing enemies—trickier ones give more points.
Saving terrified townsfolk.
Killing spies.
Keeping your buildings intact.
Keeping your defenders alive.
Killing the final boss.
When the invasion is complete, points are added for your buildings and defenders.

You need 300 points for Bronze, 600 for Silver, and 1000 for Gold.

Invasion rewards
Silver and bronze rankings rewards only apexis crystals, but if you managed to get gold reward you will get Invader's Forgotten Treasure which can contain 645 items (They can be warforged 651) and one of 4 mounts.
Note that you can get each bag just once per week, yet you will receive apexis each time you do it.

Good luck with invasions!

Comment by Corpseman

Horde Garrison Invasion Tactics
Horde Garrison Invasion 3 player Zone Defense

Comment by presteus

I share my macro to show what Invasion is completed.

/run for k, v in pairs({ Botani = 36171, Goren = 36376, Shadowmoon = 36412, Horde = 36655, Ogre = 36650, Council = 36830}) do print(format("%s: %s", k, IsQuestFlaggedCompleted(v) and "\124cff00ff00Yes\124r" or "\124cffff0000No\124r")) end

Comment by Pawwolf

Here is my Macro for knowing whether or not you have received the Bronze, Silver ,Gold &/or Platinum rewards from doing a garrison invasion for the week.

/run for k, v in pairs({Silver=37639,Bronze=37638,Gold=37640,Platinum=38482}) do print(format("%s: %s",k, IsQuestFlaggedCompleted(v) and "\124cFFFF0000Looted\124r" or "\124cFF00FF00Not Looted Yet\124r")) end

This shows up:

Bronze: Looted (in red)

or

Platinum: Not Looted Yet (in green)

Comment by Yogilaw

The Goren invasion is a pretty easy burn up until the 'Boss' gronn at the end. He has a lot more health than the other 'bosses' I have come across so can be a bit of a pain to burn down. Good trick is to deploy a 'Freezing' (interrupt) & 'Restorative' (Garrison health) crystal at the point where you tackle him. This will greatly aid the fight & save your garrison resources from dying. You buy the crystals in exchange for Resources from the Town Hall vendor just inside the building entrance.

Comment by djleeds

Was this nerfed? Completed 2 missives and spent another hour killing goren only and still won't proc...

Comment by Jazzmynn

Can this quest be abandoned and picket up again?

Comment by Stragoth

For those in Legion and beyond, to trigger this without having to farm an endless amount of mobs in the hope it'll trigger; you can purchase the Scouting Missive: Magnarok from Sergeant Crowler in your garrison for 200 resources. Complete the quest and when you hand in, he will have have the Goren Invasion quest for you.

Comment by Lorentary

From what I can gather, invasion quests can be triggered by two things:

There is a small chance when killing any enemy in a level 100 area in Draenor that a garrison invasion becomes available.
The more reliable way is to purchase the Scouting Missives from your general. Aside from the chance of triggering an invasion quest from each monster you can also trigger an invasion in the process of turning the quest in (confirmed) this chance seems to be quite high, though not guaranteed.

Links

Goren Invasion!

Repel the goren invasion.

(Speak with Sergeant Crowler again to begin)

Speak with Sergeant Crowler (1)

Repel the Invasion (1) (1)

Description

Quakes have been shaking the garrison, and our scouts haven't reported in hours.

Completion

See if you've already completed this by typing:

/run print(C_QuestLog.IsQuestFlaggedCompleted(36376))

Guides

Garrison Invasions

Goren Invasion!

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