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- "Mankind is your mask; use disguise to conceal yourself as a perfect copy of the last individual you consumed."
Disguise is a shape-shifting, defensive ability of the Prototypes. This ability allows them to disguise as the last human target they have consumed. This ability can only be used if the Prototype has consumed the DNA of a human, allowing it to assimilate the DNA into its own and gain the human's physical presence and memories.
Transformations can only be achieved with human targets, non-human targets like the Infected or the Hunter class targets only provide additional health. In order to gain complete advantage of this ability, Mercer has to stay hidden from the military while transforming.
The primary purpose of this ability is to hide from the military or infiltrate their ranks. If disguised as a military personnel, Alex Mercer was able to call in Artillery strikes on assigned targets. While in disguise, activating any offensive powers (Blade, Claws, etc.) will negate the disguise, reverting the Prototypes to their default form, although Devastators can be used without shifting back.
This ability is completely useless against the Infected as their sight allows them to see individuals infected with the Blacklight or Redlight virus. Viral Detectors can detect traces of the virus in the air and alert the military personnel in the vicinity.
The disguise consists of a disguise meter with a shutter at the bottom. When the shutter is open, Mercer is being watched by the military. Every action that might compromise Mercer's identity would fill the meter. When the meter was completely filled and marked red, it indicated that Mercer's identity had been compromised. Staying hidden or out of enemies' sight would decrease the alert level.
Enemies who had been watching Mercer's activities were marked yellow, while those who had been alerted were marked in red.
- Even with a disguise meter available in Prototype 2, James Heller can use his Sonar ability to mark enemies watching him or his target.