'Driders

Dregs sabotage usually takes the form of raids on islands, snatching supplies and valuables and fleeing before help can arrive. Occasionally they've engaged in sabotage, but that is directed at boats, not conduits. Considering that their goal is to bring back the Unity, which depended on conduits, it doesn't make sense that they would damage what they consider their own infrastructure.   Looking at conduit incidents separately, these form a much more haphazard pattern than Dregs activity. Breakage has occurred in widely distant places over short intervals, meaning there must be multiple small groups involved. The 'Driders are hard to find because they don't stand out from any other Tiderider family. They're as secretive as the Dissolvers, but even harder to pin down because there's no organization to them. There doesn't appear to be any single leader, just different Tiderider families who believe they are carrying out Delu's vision.  

Background

Tideriders in general dislike the conduits, for good reason. A conduit track is like a fence against boats. The network across the Inside Sea has made it impossible for Tideriders to travel even part of their traditional routes. Many families collapsed financially in the years after the conduits opened. Often these newly tetherless joined the Dissolvers, who served as a surrogate family. After the disaster at Aktergea, the assumption was that any remaining Dissolvers either joined another Tiderider family or continued as tetherless.  

The Barkold Incident

Because of the threat of using an Eruptor, the incident at Barkold was assumed to be the work of the Dregs. But no Eruptor was found, and the fact that only tetherless boats were sunk suggests they were targeted. Some Tideriders are known to look at the tetherless with contempt for using hybrid boats and traveling by conduit.