The Spiders essentially function as the Abidan intelligence network. They spread their awareness through the Way, sensing deviation and disorder all throughout existence. Spiders maintain the system of Sector Control, through which Iterations are divided into sectors in order to make them easier to manage.
Inter-universal communication between Abidan is also handled by the Spiders, so they have a reputation as the busiest Division. However, they are also known as the weakest in combat, so they are usually left to roles in support and management.
Most Spiders may be hard-working, but Telariel is lazy, disreputable, and prone to leaning on the perks of his position. Telariel has long ago reduced his personal responsibility to only handling communication between Judges, which rarely requires his personal attention.
When Ozriel vanished, Telariel cast his laziness aside and bent his full attention to the search. He was soon forced to admit defeat. Ozriel took steps to hide himself from the detection of the Way, and the Spider's skill is nothing next to the Reaper's.
(After receiving the blow to his pride, Telariel retreated back into seclusion. To sulk.)