Qalsneek the Bull, a Jedi Master, crafted a sea-crystal holocron known as Qalsneek's holocron.
The ruins of Derem City on Kamino yielded its discovery. During an exploration, a large library seemingly cared for by a group of Jedi Knights was found. Following the Cron Cluster's devastation, Qalsneek moved this holocron, along with numerous other water-related relics, from Ossus to Kamino.