I was told that the Brawlpub in the Deeprun Tram is now up and running again. However, I don’t have access to it and was in search to get the Blood-Soaked Invitation.
I have been killing the mobs in Kul Tiran with no avail like was suggested. I have went to the black market in search of the invitation but it wasn’t there, as suggested. I have been looking for A. Shady in the Deeprun Tram for days, and he hasn’t shown.
How do I get my toon into the Brawler’s Guild?
(Edit: Apparently the Brawler’s Guild “closed temporarily” when we moved to patch 9.0 for Shadowlands, and never came back. Some people report the Horde version still being open, but those folks already had invitations from previous expansions. I’m going to guess that the invitations no longer drop, and the NPC doesn’t appear because the Brawler’s Guild is still “temporarily closed.”)
Unfortunately, there’s no other way. You either farm up the invitation (1-in-500 average drop rate, looks like) or buy the invitation from the NPC.
The highest rated comment on the Wowhead entry below describes quite well where to find the NPC for both factions. It also says that the NPC is on a fairly short respawn timer, so if you’re in the right place, it shouldn’t take you that long to find him and buy one.
The Wowhead entry also lists enemies that this drops from. However in BfA this dropped from BfA mobs, in Shadowlands this dropped from Shadowlands mobs, so it stands to reason that in Dragonflight, it drops from Dragonflight mobs.
I don’t see any data yet that people have been looting it from Dragonflight mobs, though. So I have no help on that front. Farm for a while on some of the mobs that are actually listed on Wowhead, and then if that doesn’t pan out, farm some current DF mobs (max level would probably be your best bet.)
But all that aside, locating the NPC in the deeprun sounds like your best bet. Hopefully the maps and comments will help.
Good luck!