Deceivers were vampires of the Zephonim clan that fought in the War for Nosgoth in the mid-events of Soul Reaver seen in Nosgoth. They were known for their striking spindly appearance and abilities to mimic human form and temporarily control the minds of opponents.
"Physically less powerful than the offspring of other Lieutenants, the Zephonim make up for it through their mental abilities. The Deceivers have attempted to artificially shape and force their Vampiric evolution through self-torture, experimental alchemy and twisted breeding programs. Moreover, their devious personalities have come to manifest themselves in accursed abilities."
Deceivers, much like Team Fortress 2's Spy character, revolve around disrupting enemy lines. Their role is to sow chaos in the enemy team, while waiting for the most opportune moment to
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strike. This is unlike Reavers, who prefer attacking up close and personal, while being evasive and sneaky at the same time. While Deceivers deal less damage than other vampires, the Backstab ability deals more damage when the target enemy does not face the Deceiver. Coupled with the Disguise ability, they can appear out of thin air, or pose as a decoy to the enemy team, and then strike. The Dominate Mind ability provides a very precise contribution to the vampires -- the Deceiver could dominate the enemy and "deliver" it to the arms of his allies, or he could just let the human drop on a very high place, ensuring a kill.
The Disguise, although very powerful in its own right, has its disadvantages. If the enemy team is well coordinated, they may come upon that an excess ally is a Deceiver. Another thing is that any actions done will break the Disguise illusion. These factors make Deceiver players do very decisive, sneaky, and critical plays.