how to get rune vessel shadowlands

In order to get a rune vessel in Shadowlands, you will need to complete a quest line that begins with "A Vessel of Shadows." This quest line is only available to players who have the Still Water quest line completed, which itself is only available to players who have purchased the Wrath of the Lich King expansion.

Once you have completed the Still Water quest line, you will be able to start the A Vessel of Shadows quest line by speaking to High Priest Andorath in Andorhal. He will send you to speak with Lorekeeper Myrddal in the Western Plaguelands. Lorekeeper Myrddal will send you on a series of quests to collect shadow energy from various places in Shadowlands.

Once you have collected enough shadow energy, you will be able to create a rune vessel. This vessel can be used to store Shadowlands essences, which are used to power up your character's Soulbinds.