Vault Keys can be received mainly as the reward for completing quests in Nexomon: Extinction. There are a total of nine, and they're used to open Spencer's Vaults.
Locations[]
The quests and NPCs that reward a Vault Key are:
- Citadel Under Attack, after defeating Monkapow.
- Tyrant Mulcimer, after answering the interview.
- The Tree of Gifts.
- Catching a Namansi.
- Beautiful Parum.
- Playing with Salem.
- The Lost Ring.
- Turning Up the Heat.
- Evil Spirits.