WoW players will finally have an easier time playing their alts with the announcement of account-wide essences. This was announced in a post on the WoW forums.
When playing an alt character that is missing Essences that have already been earned on a different character, most ordinary Visions of N’Zoth activities, such as Horrific Visions, Assaults, raid bosses, Mythic Keystone Dungeons, or BFA Season 4 PvP, will award a new soulbound currency – Echoes of Ny’alotha. These Echoes can be brought to MOTHER in the Heart Chamber, and exchanged directly for eligible Rank 3 Essences. While ordinarily each specific Essence must be learned in order to unlock it for other characters via MOTHER, all Essences associated with Nazjatar and Mechagon reputations will be available if any other different character has earned any of the Essences available from that reputation.