Three Great Vault slots need three timed keys of the right level, and the fourth run is where most of the score gain lands. Buying the four together is cheaper per run than one at a time, and the group stays the same across all of them, so there is no re-forming between keys. Run them back to back in one sitting or spread them over the week — the vault only cares that they are done before reset.
from 19 EUR · 2–4 hours

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