Mortarium is an individual who accompanied Ohn, and several other men, in Tirannwn. He has a son, Onan, who still lives in Zul-Andra today. According to Ohn's diary, they were being tracked down by clans of the elves, and have escaped to the Poison Waste, and attempted to fish for swamp eels with Onan. It is not known what happened to Mortarium. He may have died of natural causes, or was chosen as a sacrifice to Zulrah.