Andurs watches and maintains the hall. As such, he is responsible for preparing the bodies for the afterlife.
Like most attendants of Halls of the Dead, Andurs is a devout follower of Arkay.
He asks the Dragonborn to recover his amulet so he can rebuke the corpses that have risen in the Catacombs. Once completed, he gives the Dragonborn 15 . Even after the Dragonborn has given Andurs his amulet, the dead will continue to rise in the crypts.
To obtain the maximum reward for this quest, retrieve the amulet, return it to him and then kill him. Since he is alone, it is quite easy to do with no consequences.