All manner of technology exists for the nullification and control of magic, but most have less and less effectiveness the higher the dominion being controlled or nullified. Some can even reverse or confine the effects of certain dominions, like necrosis and gold touch. Some are designed to be worn by people with those dominions so they won’t lose control and hurt someone or something close to them.

Magic-Resistant Materials
Inhibitor Drugs
Special Suppression Seals
Absorbing Materials

All of these examples anti-dominion tech are incredibly expensive. All the factions have sources of them, robber and cop, and some wealthy unaffiliated might have a few examples too.