To become an apostle, you need to have great skill in magic, machinery or some other skill they deem worthy. Apostles are known to replace their limbs with "perfect" clockwork parts designed by Sotha Sil. They consider this practice to be an expression of faith to their god, and also a means to improve upon what they consider to be flawed biological anatomy.[UOL 1]
Apostles are often seen as elitist by non-apostles, and they are known send others to perform menial tasks for them. They follow the Sermons of Sotha Sil and devote their work towards one goal: achieving Tamriel Final, a new Nirn.
Apostle's legal system is relatively rudimentary, mostly because it is used so rarely. Infractions, such as research sabotage or plagiarism, typically result in exile. For more serious crimes, Apostles use a method of punishment known as a cognitive prison — an induced coma where the condemned's mind is set to a recursive loop, trapping them in an inescapable mental space. By the mid-Second Era, the punishment had only been used twelve times.
Note: the following references are not from official sources. They are included to provide a rounder background to this article, but may not reflect established lore.