Sharquoi

"Q: What's a Sharquoi?"

- Press

"A: Very freaking dangerous."

- Frank O'Connor

The Sharquoi is in the Conversations from the Universe booklet found in Halo 2: Limited Collector's Edition.

Background
The Sharquoi didn't make it into Halo: Combat Evolved, Halo 2 or Halo 3. It is unknown if it will make it into future games.

This has been speculated to be another Covenant race. In a deleted scene, a mural can be seen showcasing the Covenant races, including a very large creature believed by some to be a Sharquoi. However, this creature could also be a Drinol, which may or may not have been cut at that stage of development. There is also a possibility that Sharquoi is the Covenant word for Drinol, although the name Drinol does not follow the same patterns of all the other human names.

The Sharquoi could also be something other than a species. Due to the chronology of the conversation (between Halo and Halo 2), ir could be a Covenant term for Scarabs; although this leaves it unclear why they weren't able to use them before. It could be a certain strategy or weapon that can only be used in cases where the enemy is getting beaten back to their home planet.