Korthia

For the people (like me) wondering how to get to the bottom part of the map, there's a flight route via a Flayedwing Transporter next to Alexandros in Keeper's Respite. Coordinates 60.84, 28.59

If you opened your way to Korthia once then there is a way to skip it for every new alt.

1. 
   
2. Get al least 60 level to be able to skip main SL-campaign.
3. 
   
4. Go choose your covenant.
5. 
   
6. Do quests for your conenant step by step until you get the quest to return to Highlord Bolvar Fordragon from your covenant sanctum.
7. 
   
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   • This includes a bit of quests in your covenant sanctum:
     
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     • Venthyr: Sinfall, The Court of Harvesters, Sacred Covenant, Back into the Darkness
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     • Necrolord: Taking The Seat, Welcome To Our House, Power of the Primus, The Soul Contact
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     • Night Fae: The Heart of the Forest, The Boon of Shapes, Do What We Cannot
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     • Kyrian: Among the Kyrian, A Proper Reception, Elysian Hold, Friends in Dark Places
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   • Then 3 rules-quests from [npc=162804] in The Maw: Setting the Ground Rules, Rule 1: Have an Escape Plan, Rule 2: Keep a Low Profile, Rule 3: Trust is Earned
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   • Then returning to Highlord Bolvar Fordragon to Oribos: Hopeful News
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   • Then returning to your covenant sanctum:
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     • Venthyr: Anima Awakening
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     • Necrolord: Return to Draka
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     • Night Fae: [quest=62894]
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     • Kyrian: Return to Adrestes
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   • Then a bit of quests there (getting your conduits):
     
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     • Venthyr: <here you can use skip-dialog 'I know my way'>, [quest=62918], [quest=62919], A Conduit For Change, Our True Purpose
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     • Necrolord: <here you can use skip-dialog 'I know my way'>, [quest=63003], [quest=59597], [quest=61388], Conduits, What Are They For?, No Rest For the Dead
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     • Night Fae: <here you can use skip-dialog 'I know my way'>, For Queen and Grove!, The Forge of Bonds, The Boon of Binding, Strengthening the Bond, A Conduit for Growth, [quest=62899]
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     • Kyrian: <here you can use skip-dialog 'I know my way'>, Dangerous to Go Alone, Soul Meets Body, Strengthen the Bond, A Conduit for Good, Our Eternal Charge
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   • Then returning to Highlord Bolvar Fordragon to Oribos again: The Highlord Calls
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8. In Oribos you're able to get Into Torghast. Don't claim it! Click to Highlord Bolvar Fordragon again and choose 'Skip: I have been in Torghast before'.
9. 
   
10. Then click Highlord Bolvar Fordragon again and choose 'I have heard this tale before. Skip ahead to Korthia'.
11. 
    
12. Now you can claim Korthia Awaits. It leads you to the other floor of Oribos. There is a portal to Korthia in left top corner.
13. 
    

PS: You may want to get [item=187339] for fast travelling in Korthia.
PPS: You also may want to get Venthyr as your covenant because of Door of Shadows. This spell if very useful in Korthia.

There's a bunch of mount drops in this zone:
[npc=180160] drops [item=186652]
[npc=179472] drops [item=187183]
[npc=179684] drops [item=186645]
Kyrian Covenant specific [npc=180032] drops [item=186483]
Night Fae Covenant specific [npc=180014] drops [item=186492]
Necrolord Covenant specific [npc=180042] drops [item=186489]
Venthyr Covenant specific [npc=179985] drops [item=186479]