Complete 5 Timewalking Dungeons for the weekly quest to receive 1 piece of Normal Difficulty Vault of the Incarnates loot.
You can accept the quest from within the Adventure Guide (Shift + J). Completing 5 Timewalking Dungeons rewards 1 piece of 389+ loot. The bag has a chance to contain Unique Drops from the raid, so the loot can go up to Item Level 405.
You’ll find more about Warlords Timewalking here.