Zone: Ashenvale (Kalimdor)
The entrance to the Blackfathom Deeps is not an easy one to find. You have to go into the ruins as shown in the picture and dive through the water to a path. Afterwards you have to follow this path for about 200-300m until you see the entrance portal. The focus in this instance is on the rare items. These can be worth up to 100,000 gold and more.
Farming Route
Once you have found the entrance, the instance itself is no longer a problem. You can not get lost here, because there is only one direction. There is a trick how you can spawn 30-40 ghouls at the penultimate boss. You must not kill the bosses Gahmoo-Ra 1 and Subjugator Kor’ul 2 , then after killing Twilight Lord Bathiel 3 you can activate a brazier (see picture below). After that ghouls spawn in the whole room. The way to the final boss is not worth it, because there are no trash mobs for loot.
Items to find in this dungeon
Short explanation: Since the prices for Transmog fluctuate strongly depending on the server, I no longer give fixed values in gold. The more valuable items are simple marked with more stars. An item with 5 stars 
is worth more than an item with only one star in comparison. I hope this gives you a small impression on which items to be excited about when farming!
The Ritual Set
Other transmog worth mentioning
How to leave a dungeon/raid quick
At the end of an instance, the goal is to get back to the entrance as quickly as possible. Only a few instances have an exit at the end. You can use the following methods:
Druid – Dreamwalking
The Druid is the ideal choice for farming Transmog, as he can use the Dreamwalk to port himself to the Emerald Dreamway. Once there, press Dreamwalk again and you’ll automatically be in front of your last instance. If you have not played Legion, you will need to use Teleport: Moonglade.
Monk – Zen Pilgrimage
Monks can use the Zen Pilgrimage spell that will teleport you to your home temple. After using this spell again you will be relocated to your last location (which is the entrance of the last dungeon/raid you were in). The spell has a 60 second Cooldown.
Death Knight – Death Gate
As a Death Knight you can use Death Gate to teleport to Ebon Hold. After using this spell again you will be relocated to your last location (which is the entrance of the last dungeon/raid you were in). The spell has a 60 second Cooldown.
Group Finder
Use the Group Finder Tool to create and register a Random Group under Custom. Then click on your avatar image in the game and select Leave Group. After 60 seconds, you will be ported out of the instance and will be standing alive at the spirit healers location. You should time this function so that you are only a few seconds from the end of the instance before you are ported out.
Death
In some instances, there is a chance to die from water, lava or from falling damage.