Blood-Soaked Invitation

The Blood-Soaked Invitation provided access to the Brawler's Guild for Battle for Azeroth.

Source
It is sold by A. Shady for. It is also a rare drop from Battle for Azeroth mobs.

This item could be found when you completed Legion dungeons.

It had a chance to be looted from Emissary chests:
 * Dreamweaver Provisions
 * Farondis Lockbox
 * Highmountain Tribute
 * Kirin Tor Chest
 * Nightfallen Hoard
 * Valarjar Cache
 * Warden's Field Kit

It could also be farmed from vrykul at the elite area Shield's Rest in Stormheim.

Trivia

 * The Mists of Pandaria version of the item previously appeared on the Black Market Auction House, with the initial bid being . Additionally, an invitation could also rarely be found on one of the six faction champions required for the I'm In Your Base, Killing Your Dudes achievement in the Krasarang Wilds. In patch 5.3.0, all rares on Pandaria (except those on the Isle of Thunder) were added a slim chance to drop an invite as well.