For anyone farming the new Brewfest mount and Dragonriding Manuscript, there’s currently a method using multiple accounts that can significantly increase your chances.
How it works:
1. Log in on up to 5 accounts (on the same Battle.net - Check out my Multiboxing Guide if you are confused about this).
2. Group all your characters together.
3. Queue for Coren Direbrew and defeat him.
4. Receive the Keg-Shaped Treasure Chest from defeating Coren Direbrew. (This can only be done once per day)
5. Open all chests, once per day, per different account, you DO NOT have to open all chests at the SAME time, you just have to be logged in all those accounts when you RECEIVE the chests.
The important detail is that the first chest you open each day has a noticeably higher chance to drop the mount/manuscript. By doing this on multiple accounts simultaneously, you’re giving yourself several “first-chest” rolls every day instead of just one. There is also bad luck protection that constantly stacks up on all 5 accounts non-stop everyday if you don't loot it.
Requirements:
1. All characters should be on the same faction for easy invites.
2. Characters need to be at least level 10.
3. Up to 5 WoW accounts on the same Battle.net can be used.
Starter Accounts work fine (no active sub required) as long as you’ve unlocked a heritage race on your account this is possible. This is completely FREE to make starter accounts
https://www.wowhead.com/item=117393/keg-shaped-treasure-chest#english-comments .