Guide
Vault Key Fragments
Vault Key Fragments are consumables that unlock higher-tier Vault runs. Collect them from story beats, bunkers, and world activities, then spend them at Vault doors.
Each major region has at least one Vault entrance. Higher tiers cost more fragments.
Order bunkers and Dominion activities are reliable fragment farms after the campaign.
Guardians drop vault-exclusive legendaries such as Kaidos Fang.
Do not dump all fragments on early Fadefields tiers if you are near Dominion unlocks.
Last verified Sep 21, 2026