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"The Onu-Matoran knew that the creatures could not be rushed. Although tame, they were still highly temperamental. If they chose to be stubborn and not harvest the airweed, he would have a lot of explaining to do when he got back to the city."
— Narrator, City of the Lost


The hydruka Thulox
Powers Solidified Air Bubble creation
Pit Mutagen immunity
Conservation status Common
Known locations Mahri Nui (formerly)

Aqua Magna[1]

Pronunciation high-DROO-kah[2]
Set 8931 Thulox (instructions)
8932 Morak (instructions)

Hydruka are stubborn aquatic Rahi, formerly domesticated by the Matoran of Mahri Nui.


The hydruka species was created by the Makuta using Viruses and Liquid Protodermis as one of the Rahi to inhabit the Matoran Universe.[5]

When the Great Cataclysm struck and the Pit was destroyed, allowing its occupants to escape into the Black Water of Aqua Magna above, a colony of hydruka migrated to the planet's waters as well.

300 years ago, when the Mahri Nui landmass broke off of Voya Nui and tumbled into the ocean, it collided with the Fields of Air, dislodging the plants' air bubbles and saving the Matoran population and their village. Over the next 300 or so years, the Matoran of Mahri Nui tamed and trained the hydruka to harvest the air bubbles on the airweed. Because this process was so essential to the Matoran's survival, the post of hydruka Guard was developed. After witnessing the hydruka's defense mechanism, launching Solidified Air Bubbles at their enemies, the Matoran were inspired to develop the Air Launcher technology that they used to defend the city.[6]

The hydruka Morak.

When the Toa Mahri destroyed the Cord and returned Voya Nui to its former position on the Southern Continent, destroying Mahri Nui in the process, the resident hydruka colony remained in the sea.

After a few months, Mata Nui restored Spherus Magna, including Aqua Magna. The hydruka continue to live underwater, relatively unaffected by the restoration.[1]

Abilities and Traits

Hydruka are able to differentiate strands of airweed that contain viable air bubbles from those that do not. Hydruka defend themselves by firing Solidified Air Bubbles generated by an anatomical element in their tails,[7] and some have bioluminescent carapaces that glow in areas of low light. They possess a natural immunity to the Pit Mutagen.[citation needed] Hydruka are also the preferred prey of Venom Eels.[citation needed]

Hydruka are notoriously sensitive, irritable, and temperamental. Attempts to rush their harvests would frighten or anger them, and they must be allowed to work at their own pace. The Matoran of Mahri Nui often gave them names to be able to better identify each specimen and keep track of the herds.[6]

BIONICLE.com Stats


Known Hydruka

  • Thulox - a loyal male hydruka
  • Morak - a stubborn and ill-tempered male hydruka

Set Information

Hydruka Sets

8931 Thulox and 8932 Morak were released as small sets in spring 2007, simultaneously with two Matoran: 8929 Defilak and 8930 Dekar. They consisted of 39 parts and 40 parts, respectively, including in each a dark silver Air Launcher and two Solidified Air Bubbles. Thulox primarily features dark red armor (on his anterior half) and black armor (on his rear legs) separated by a new armor piece also featured in 8917 Kalmah that blends from dark red and black plastic. Morak chiefly features dark blue armor as well as a new armor piece (released the same year in 8916 Takadox and 8935 Nocturn) in a blend of transparent blue and glow-in-the-dark plastic.



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Online Games


  1. 1.0 1.1 "Official Greg Dialogue", post 11964. BZPower Forums. (archived on greg.thegreatarchives.com)
  2. "Hydruka." Encyclopedia Updated, p. 46.
  3. 3.0 3.1 "Thulox." Encyclopedia Updated, p. 141.
  4. 4.0 4.1 "Morak." Encyclopedia Updated, p. 93.
  5. "The Makuta." Makuta's Guide to the Universe, p. 63.
  6. 6.0 6.1 City of the Lost. BIONICLE Legends 6.
  7. "Official Greg Discussion", post 7741. BZPower Forums. (archived on greg.thegreatarchives.com)
  8. "Official Greg Discussion", post 7347. BZPower Forums. (archived on greg.thegreatarchives.com)
  9. "Mahri Nui." Makuta's Guide to the Universe, pp. 52-53.
  10. "Official Greg Discussion", post 7781. BZPower Forums. (archived on greg.thegreatarchives.com)

See also