From Halopedia, the Halo wiki

"The Monitor's Encephalon has served its purpose! The Reformation has begun. Nothing can stop it."
— The Harbinger[1]
Despondent Pyre AI Matrix
Despondent Pyre's encephalon

An encephalon[1] is a piece of Forerunner technology and a vital component of a Monitor. It contains, among other things, the routines needed to summon a Halo Ring's Reformation Spires. Like an activation index, an encephalon can be stored in digital format.[2]


On May 28, 2560, the Harbinger, who desired to restore Zeta Halo's Silent Auditorium, forcibly extracted Despondent Pyre's encephalon. She subsequently used the encephalon to summon the Spires needed to carry out the Reformation.[3] The Weapon later stole the encephalon from the Harbinger and used it to shut down all the Reformation Spires.[2][1]


Encephalon is another word for brain.


List of appearances[edit]


  1. ^ a b c Halo Infinite, campaign mission Reformation: The Command Spire
  2. ^ a b Halo Infinite, campaign mission Reformation: Nexus
  3. ^ Halo Infinite, campaign mission Connections: Conservatory