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This item is a very rare drop from Mistress Sassz'ine in the Tomb of Sargeras on all difficulty modes, including Raid Finder.
Here you can buy Abyss Worm for EU or US Servers.
You'll get guide for getting Abyss Worm
You'll be able to get Abyss Worm mount
Additional budget for Character transfer or Character boost to max level. BMAH Services in Shadowlands now requirement to have a max level character on server, so Trial character will not work.
Free time on evening, if you choose selfplay option