The Bartender of the Dragon Inn plays a small role in the quest Zogre Flesh Eaters, where the players must show him the Dragon inn tankard in order to learn that it once belonged to the late Brentle Vahn. He also features in Alfred Grimhand's Barcrawl, where he sells the player a Fire Brandy for 12 coins.
Additionally, it appears that the bartender is knowledgeable about the gossip of Yanille and its community, as he seems well acquainted with the gossip thereof. As such, during the quest he is able to reveal the whereabouts of Brentle prior to his "disappearance", and signs a portrait of Sithik Ints to verify his identity.
As with all bartenders, he of course sells various alcoholic beverages. Dragon bitter, Greenman's ale and Beer are all available for purchase, however the player has to navigate through some dialogue trees.
According to Mod West, Madame Caldarium is his wife, and Balnea, who players meet during the quest As a First Resort in RuneScape 3, is her daughter. 
- ↑ Jagex. Mod West's Twitter account. 8 December 2017. (Archived from the original on 27 May 2020.) Mod West: "[Is Madame Caldarium actually Balnea from the live game?] Nope, she is her mother and the Dragon Inn barkeep is her husband. Not sure there is a reference to that in game, but that's the canon."