A Timewalking Merchant is an NPC you can visit to purchase various goods such as cosmetics, mounts, and equipment in WoW The War Within.
Classic Timewalking is coming in Patch 11.0.5! Full overview and rewards | The War Within
The Timewalking merchant is not a regular merchant, but a part of the Timewalking event, which takes place every three weeks and lasts for a week. During the event, you can experience Timewalking dungeons and even raids from previous expansions, and you can use unique currencies to obtain various goods.
Here you will find the Timewalking Vendor in The War Within.
Timewalking is one of the most popular events in World of Warcraft. The event includes Timewalking dungeons and sometimes even raids, and it is also one of the best ways to level up your characters.