Near the tail of the shuttle is a lootable shelf with the Space Shuttle keychain. Explore the lower floors to find a model human skeleton.
Open the box to get the Plushie Hippo keychain. Then, explore the new area above the leader's room. Lincoln Bust: 'Lincoln Memorial' mission - Loot the containers in the giftshop area under the memorial. Gold Bar: 'Treasury' mission - When entering the vault itself, search the deposit boxes to find the Gold Bar keychain. Blood Vial: 'Roosevelt Island' stronghold - Look for a lootable dresser before going down into the underground tunnel.
Successfully complete the indicated task to unlock the corresponding keychain.
Keychains are unique customization options you can unlock throughout the game. Additionally, the Merciless can also drop from any Hyena boss. Note: Try doing the mission with other people that already have the Merciless so they can trade it to you if it drops for them.
