Unknown intelligence

This unknown intelligence is an entity that created the Bestiarum, a document detailing the state of the galaxy after the Great Schism.

History
The intelligence recorded information into a document sometime after the Great Schism, including information about several species' homeworlds and the Forerunners' Technological Achievement Tiers. Sources for the information included the Halo Array, Shield Worlds, 2401 Penitent Tangent, and 343 Guilty Spark, with the latter Monitor's observations "under investigation".

The intelligence showed a little sadness when it theorized the San'Shyuum population to be less than 1,000 after the Flood invasion of High Charity, and it was happy to see at least one of the Builders' "most humble creations", the Huragok, had survived the firing of the Array.

Identity
The unknown intelligence shares a speech pattern with a Catalog unit that awoke on November 7, 2552, which also matches up with the time-frame that the document the unknown intelligence made was last updated. This means it is possible both this intelligence, and that specific Catalog unit are the same being.