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Level 12 promethean

A Level 12 Promethean Combat skin

Combat skin is a form of body armor used by the Forerunners. There is a classification system for combat skins, running from Class 1 to 18, and possibly above. According to 343 Guilty Spark, the MJOLNIR Mark V is ranked on this scale as equal to a Class 2.[1]


Little is known about the combat skin other than that it was used by infantry personnel. It is comparable to the Mjolnir Armor but far more advanced.

While guiding John-117 through the Library, 343 Guilty Spark questioned the use of "such ineffective weapons" to combat the Flood. He notes that the MJOLNIR is ill-suited to combat the Flood, and recommends that he upgrade to a Class 12 Combat Skin from the MJOLNIR, which is ranked on the Forerunner classification system as a Class 2. On the other hand, Guilty Spark also notes that the MJOLNIR will serve John well when the Flood begins converting Halo's atmosphere, commenting that he is a "good planner."[2] Upon learning that there was a powered armor system six times more powerful than the MJOLNIR, John expressed enthusiasm at the opportunity to wear one.[3]

The Terminals on Installation 00 indicate that other Combat Skin classifications existed, ranging from 1 to 4, and that there were other suits of a similar nature, such as the Battle Harness, with its own classification ranging from 1 to 6, and the Platform Interface Skin. Eventually, all Civilian personnel were required to wear at least a Class 8 Combat Skin unless in core areas, and all Military personnel were required to wear at least a Class 12 Combat Skin.[4]

During at least the early years of the Forerunner-Flood war, Forerunner ground troops used Combat Skins that, while certainly powerful, lacked energy shields, leaving their wearers extremely vulnerable to Flood infection. It is likely that, rather than representing the peak performance of the technology, it is indicative that the Forerunners were woefully unprepared for the Flood onslaught, and were initially slow to adapt their equipment and technology to fighting a purely biological foe.[5]

During the Battle of Installation 00, Guilty Spark can be heard lamenting that John did not upgrade his Combat Skin. The fact that the Mark VI is more advanced than the Mark V that Guilty Spark had previously encountered and is still classed as a Class 2 may indicate that the Combat Skin class system is based on another factor other than combat performance, or that despite its upgrades it was still inferior to a Class 3 Combat Skin.[6]


Combat Skins were used by the Forerunners during their war with Humanity. After Humanity had been beaten and de-evolved by the Forerunners they continued to wear their Combat Skins against their new foe, the Flood. 

When awakened by John-117, the Ur-Didact was wearing his Combat Skin.


  • Any Forerunner's combat skin can use lighting on their skin to convey the emotions of its wearer.[7][8]




  1. Halo: The Flood 2010 edition - Page 268
  2. Halo: Combat Evolved, The Library
  3. Halo: The Flood 2010 edition - Page 268
  4. Halo 3, Terminals
  5. Halo Legends, Origins
  6. Halo 3, The Ark (level)
  7. Halo: Silentium - page ???
  8. Halo 4 - Forerunner