Updated Definition

necromancer:

  1. (archaic) In legend and story, an evil figure who makes pacts with various personifications of entropy, offering service in exchange for power. In these stories, the fundamental error of the necromancer is their belief that they hold the advantage in such dealings – perhaps not the most wise belief where beings which crave destruction without qualification are concerned.
     
  2. In modern eschatology, people, organizations, or even polities that trade with unknown information entities across the extranet, or which they have discovered in some lost but functional archive. Such entities normally offer valuable information or computation in exchange for services in the physical world, typically intended to provide them with computational power, assembler resources, or access.

    As with their legendary counterparts, the modern necromancer is prone to believe that they hold the advantage in their dealings (or can if sufficient precautions are taken), and are aware that their patron will attempt to exploit them. Likewise, they are incorrect in this belief, and the consequences from a necromancer who succumbs to the wrong patron can include finding himself the first, and by no means only, victim of a blooming perversion.

    Thus, Imperial State Security and its counterpart organizations in other polities enforce the Archive Safety Code on dealing with such entities with great vigor, deploying both regular agents and combat eschatologists accordingly.

– A Star Traveler’s Dictionary