Essences remain the stumbling block for Wow gold classic alternative characters, but it is possible to receive an alt in reasonable shape in 8.3, or even perfectly min-maxed.
You can become a Void Wraith, a rare mob in World of Warcraft, thanks to a secret recently awakened by the Secret-Finding Discord. It is a very long series, finishing in the ability to become a giant purple bad wraith, marked on players' maps as a rare creature with extra rewards. You'll be hostile to both factions, and if you manage to kill several players until you are killed, you'll reap a few rewards. Amusingly, players that kill you will obtain the very same benefits as killing other rares, including currency and azerite power for their neck pieces.
You will see a Shard of Corruption in a number of buy classic gold those glowing purple cracks on the floor. Looting it offers you a quest to find 20 of these.