Expanding my earlier concept:
"[Construct Family] are a race of planar constructs, similar to inevitables, but opposed to those in nearly every way possible. Highly varied in form, tactics and methods, their ultimate goal is spreading chaos - whether by aiding lawbreakers directly, opposing forces of law or - ironically enough - taking law to absurd peaks. [The term 'Infallibles' derives from this - no matter what path they take, they will usually suceed bringing at least some level of chaos.]"
"[Anti-Inevitables] are slightly better-known members of the [Construct Family]. An [Anti-Inevitable] appears as a whirling maelstrom of blades, needles and sharp disks, made up of most, if not all, solid materials in existance. It can, however, coalesce into a slender humanoid shape.
[Anti-Inevitables] are concerned with the written word, especially in legal texts - they often encourage a strict reading of the letter of the law, and call for ever more absurd interpretations that, while obviously out of the spirit of the law, are impossible to refute. In other situations, they may aid deal-breakers directly or influence someone to break a deal. Sometimes, they defend deal-breakers against kolyaruts, who are often seen as their direct counterparts despite the obvious differences."