Talk to the NPC Ta’hsup in Oribos.
This NPC is located next to the Great Vault in Oribos.
This NPC has a quest called "Timeworn Keystone" that is needed to take to get a Tomeworn Keystones.
You start with a +2 keystone once you accept the quest.
That keystone will last for the entire Legion Timewalking event.
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