Unidentified aquatic creature (Earth-2042)

This creature is an aquatic predatory animal native to Sanghelios. It possesses several tentacles.

History
While fighting boat-to-boat duels during their training, the future Shipmaster of the Fleet of Righteous Vigilance and some of his clanmates encountered one of these creatures. After the future Shipmaster knocked his opponent off the boat, the creature noticed the splashes and attempted to drown the Sangheili who had been knocked off of the boat. The Sangheili could not fight against the creature's strength, and presumably drowned and was consumed by the creature. Years later, the Shipmaster expressed no pity for his clanmate, noting that only the worthy would survive.

Source

 * https://www.halopedia.org/Unidentified_aquatic_creature