Invulnerability Hunter

The Invulnerability Hunter is a boss monster found in Doom 3: Resurrection of Evil. It is the final Hunter the player will encounter. Like the Berserk Hunter, the Invulnerability Hunter is noticeably larger than a Hell Knight, and has a bulging, extremely muscular body with a blue aura surrounding it.

In game
The Invulnerability Hunter draws power from three active power coils in the room, rendering it invincible. Destroying the open coil will cause a temporary shutdown, leaving the Hunter vulnerable. When the remaining coils reactivate, repeat the process. When all the coils are destroyed, the Hunter will no longer be able to retain its invulnerability. One can hide from the Hunter by running underground, but it will stomp the ground to damage the player should he be standing up.

When it is vulnerable to attack use the artifact's helltime ability and pull out the chaingun and start firing until he becomes invulnerable. Then, in its invulnerability state, it will attack the player by shooting energy balls and electric shockwaves.

While it may be tempting to try to use the Berserk power of the Artifact to conserve ammo by punching the Hunter with the player's fists, one will find that the electric properties of the monster render it invulnerable to melee attacks - instead, damage will be dealt to the player and the Invulnerability Hunter remains unharmed. The super shotgun, chaingun, plasma gun, and rocket launcher remain the best choice of weapons due to this fact.

Killing it will gain the invulnerability power for the Artifact.