From Halopedia, the Halo wiki

A creature is killed by the activation of the Halo Array and is instantly decayed by the Lifeworker solute.

Solute is a Forerunner substance designed by the Lifeworkers to prevent ecological disasters on worlds struck by the Halo Array.[1]



When the solute was being distributed, the ships distributing it left yellowish curtains.[1]


The purpose of the solute was to cause every animal killed by the Halo Array to instantly decay into their component molecules. This was meant to prevent pollution of the atmosphere due to decomposition[1] which had happened on Faun Hakkor following the test firing of Installation 07.[2] While acknowledging the intended purpose of the substance, Catalog also contemplated the possibility that the solute could have been used as a convenient means to obscure the firing of the Halos and the subsequent mass extinctions from future investigators.[1] Despite this, evidence remained in the form of an absence of any fossil evidence. Humanity in 2332 called this the Ross-Ziegler Blip.[3]


Firing of the Halo array[edit]

The solute was spread over many of the planets before the Halos were activated. Catalog observed solute being released on Erde-Tyrene during the Forerunner-Flood war as the Lifeworkers oversaw the indexing of the planet as part of the Conservation Measure.[1]

List of appearances[edit]


  1. ^ a b c d e Halo: Silentium, string 1
  2. ^ Halo: Cryptum, chapter 12
  3. ^ Halo: Renegades, chapter 23