Synth is a synthetic magic drug that increases the users magical abilities, created by Redner Industries.
The earliest trials were a success: with it, humans could heal faster than with any medwitch or Fae power for an hour. But later trials did not go according to plan. Vanir and Humans go out of their minds when given it in high dosages. High dosages of synth would make the person taking the drug to kill everyone around them and themselves in a gruesome fashion.
Micah Domitus leaked the Synth on to the street as a recreational party drug. He also went to Danika and Bryce's apartment where the Pack of Devils was at the time and used his Magic to disable them. He then injected Danika with Synth, which caused Danika to rip her pack apart before turning on herself. Micah then summoned a Kristallos demon to cover his traces.
Micah injected Bryce synth so that it would heal and fix whatever was broken with the Horn inside her. This would mean that the horn would then be whole once again and could be used through Bryce. He did not intend for Bryce to survive the synth. He just wanted her to open portals to another world, so he could have an army to destroy the rebels. Micah was successful in his plan and the seven gates in Lunathionopened portals to Hel. Bryce managed to use her Starborn power and the Horn to close the portals and restore the city.
- The venom of a kristallos demon is an antidote for Synth. This is because the venom naturally exists to nullify the magic of its victims; as a result, it also eats away at the synthetic magic, thereby reversing an overdose before it can become deadly.