First seen in Deadhouse Gates, the dhenrabi were sea serpents that wrapped up whales and ships alike, blew out all the air under their armored skins and sank like a stone, taking their prey with them. They had a wide razorlike mouths and correspondingly wide heads, some as wide as ten arm-spans. Their bodies were covered in segmented armour of a deep green colour with each segment revealing long chitinous limbs. The creatures could be as long as eighty paces.
During mating season, the males were said to spend their time competing for mates rather than eating. Sharks, normally afraid of individual serpents, would trail along the edges of dhenrabi gatherings to consume the losers' remains.