Simply walk to the Prancing Seahorse, across the road from Luxurius' Mansion on Lanilor Lane. You'll find the pair outside, arguing about who should go into the temple. It seems that Aulus thinks that Minius isn't experienced enough, and Minius thinks that Aulus is too old. Neither one wants to the other to die at the hands of the undead, and they ask you to decide who should go. You can mindread Aulus for 7500 exp to discover that he is hiding an injury. This adds a dialogue choice but doesn't effect the outcome. If Minius is sent to the Temple of Nimir: