Ghost

Description
At higher Tiers, the Ghost will shoot up to two shots.

Strategy
Ghosts have extremely high but very low Health, making rapid-fire multi-hit attacks such as  and  effective against them. also ignores. will apply 20, which also pierces , making a instant kill against Ghosts of all Tiers.

Ghosts will also reduce their own Health by 1 whenever they shoot. This makes them an easy method to unlock the Plausible Deniability Achievement.