Primordial Emblems are used to upgrade Signature Items from level 1 to level 10. 20 Primordial Emblems are required to unlock each Signature Item, 75 Emblems in total to upgrade Signature Item to level 5, and 220 Emblems in total to upgrade it to level 10.
Primordial Emblems can be obtained from currently ongoing Tavern Bargains event, King's Tower floors, gift sets, other events and AFK Rewards starting from Chapter 17. They can be also bought from the Store for gold, and while the price may seem hefty, Store is a reliable source of Primordial emblems.
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