Tazavesh, the Veiled Market is the mega-dungeon added into World of Warcraft, with the recent Chains on Domination patch, and just like the Mechagon mega-dungeon, there is a hard mode to complete which will grant extra rewards and a unique mount.
Players will first need to acquire a necklace found within the dungeon called Passably Forged Credentials before they are able to begin.
How To Activate Tazavesh Hard Mode In Shadowlands: Chains Of Domination
Players will need to defeat the first boss on normal mythic difficulty, which will open up a staircase to the right of the encounter. Hidden in the corner will be a vendor called the Questionable Trader.
Talk to this broker and purchase the Fraudulent Credentials neckpiece from them.
Keep moving forward to Au'Myza's Oasis and complete the trading event there.
Have one player in your group pick up the item and deliver it to the broker, while the rest of the party defends that player.
Do this three times and the final Broker will give you the password.
From here, talk with Au'manal who will exchange the Fraudulent Credentials for Passably-Forged Credentials.
With the new neck equipped, start the quest Tazavesh: A Hard Bargain to begin the hard mode.
It is important to note that doing this for the first time, you will need to use a sixth player whether it be a unique player or an alt of a party member to create a fresh instance as you need to kill the first boss again.
Once you have a fresh instance, use the neck to turn into a broker, and talk to Fe'tajid at the start of the instance to begin the hard mode.