All you have to do is obtain a Dwemer puzzle box from a local ruin called Arkngthand. However, he wants a favor before he gives you the information. Antabolis can be found in the training room on the lower floor of the Balmora Fighters Guild in the center of town. Your first task from Caius is to talk to Hasphat Antabolis about the Nerevarine and Sixth House cults.
