Respiratory system
Respiratory system
Release date 1 October 2015 (Update)
Members only? Yes
Race Organ
Quest NPC? No
Location Abyssal Nexus
Sells items? No
Gender N/A
  • Provides vital gases to support a Sire in stasis.
  • Noxious gases are being exchanged.
  • It appears to be dying.
  • The vent is silent.

The respiratory system is encountered during the fight with the Abyssal Sire.

Four systems are found in each chamber. They are protected by several tentacles which will attack players if they get too close to them. In addition, while the tentacles are awake, they will provide a massive defense buff to the systems, making the player's attacks deal 0-3 damage. Once all four systems are destroyed, the player can start the next phase in the fight.

Each system has 50 hitpoints, level 80 in Defence, and is immune to both poison and venom. In addition, it will heal one hitpoint every five seconds. Respiratory systems can only be attacked with magic or ranged, as melee is unable to reach them.

Respiratory systems are considered by the game to be Abyssal demons, allowing accuracy and damage buff of the slayer helm to be utilised against them. They do not count towards the task.


  • Prior to the update on 24 August 2017, the slayer helmet did not provide an accuracy and damage buff against the systems.

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