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Ranged electric attack, revival of dead zombies.
The Reviver, also called a "lightning dog" by Alyx Vance, is a Headcrab variation previously unknown before the Combine invasion. It is only encountered in the chapter The Northern Star throughout the eponymous hotel.
The Reviver resembles a scorpion with a flattened blue body. It is capable of taking a lot of damage before dying. It can also enter the chest cavity of dead zombies to create a Reviver Zombie. It also has the ability of shooting an electric ball which deals a small amount of damage and disables the indicators on the Gravity Gloves. The presence of a Reviver causes interference in Alyx's radio communications with Russell.
Upon death, the Reviver expels its heart which functions similarly to a Combine Power Cell and can even be used in place of one.
Behavior and Skills
Revivers are very skittish in nature. They prefer to wait and ambush prey, firing electrical balls from a distance to catch them unaware. When approached or hurt, they'll release a smokey electrical cloud to confuse their foe, and then either run away or pounce on their attacker. When inside a Reviver Zombie they're a lot more aggressive. They'll lumber toward their attacker, trying to hurt them with the lightning they produce. They'll also produce long range shocks that travel in straight lines across the floor. This change in behavior implies a somewhat symbiotic relationship with Headcrab Zombies.
Revivers appear to be territorial even to other members of their own species. Two can be seen growling at each other when Alyx approaches the top of the Northern Star. This is why rarely more than one is encountered at a time in the hotel. However, these two appear to put their differences aside when a more dangerous creature arrives in their domain, in this case Alyx Vance.
After being critically injured and near death, Revivers will stop attacking and limp along the floor slowly while making whimpering sounds.