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Tools 
The five masks
Each mask of Leviathan is won by a task. A sound plays when it is done, and the mask waits in the mask room, reached through a portal between the Submarine Launch Facility and the upper crafting room, once per round. Every mask lets the player breathe under water without the ABA.
God mask
Every player completes all three of their personal challenges. The mask room lists its effects: one more hit from all enemies, a longer sprint, 50% more damage and 33% less damage from all enemies. Guides advise it for the final boss.
Shark mask
Shoot the six sharks that swim outside the base: at the spawn, near Stamin-Up, past the barrier from Stamin-Up towards the Biodome, outside the Cafeteria where Deadshot stands, near Speed Cola, and outside the backup power room. It makes the player faster under water and lets the player use the Hacker there.
Golden ABA
Flood every area that can be flooded. The Steam guide lists the three areas of the excavators, the Cafeteria, the Power Room and the Laboratory; Sassy Asi adds the room of the submarine, whose windows break with a grenade. One more hit from the zombies and a longer sprint.
Leaper mask
Kill enough Leapers with melee; Ernie935 counts 30. Half the damage from the Leapers and a third more damage against them.
Diver mask
Kill three Divers with the Harpoon Gun. The code 3483 calls a Diver. One more hit, half the damage from the Divers, a third more damage against them.
