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Masks are objects which are normally worn on the face for numerous purposes: ceremonies, entertainment, disguise or perfomance.
There are plenty of Masks in the Tomb Raider Universe.
Tomb Raider II
In the Tibet Section there are three Masks to be found:
The Golden Mask
Tomb Raider III
In the level Lost City of Tinnos there are four Masks to be found:
The Angel of Darkness
In the Louvre Section there are Masks to be found as a part of the gear:
Lara Croft and the Guardian of Light
There are many Masks to be found as relics: