Kelder is involved in the quest Magistrate's Orders.
Magistrate Vanard asks Hawke to look for a dangerous criminal who escaped and is now hiding in a Ruined Passage beneath some Abandoned Ruins on the Wounded Coast. Vanard has already sent members of the Kirkwall City Guard there, but they were slaughtered by unspecified "creatures". Vanard promises Hawke future support in exchange for returning the criminal alive and unharmed.
At the ruins, Elren, an elven merchant from Kirkwall, tells Hawke that the criminal has kidnapped and killed his daughter, Lia, and asks that Hawke execute him. Lia is in fact still alive inside the ruins. She pleads with Hawke to spare Kelder's life, as she believes that demons made him hurt her.When Hawke finally confronts the murderer, they learn that he is Magistrate Vanard's son. They can choose to return him to the magistrate, which will result in a 1reward (2 with blackmail) and rivalry from their companions, or kill him. Killing him will result in a reward of 1 from Elren at the entrance, approval from some companions, and a promise of revenge from the magistrate.