Hydromel

Hydromel was a vaccine used by the Vanir to stave off Lazar's disease.

History
Hydromel was a phosphorescent green organic compound, which was inserted in the Vanir's armour to protect them from infection from the disease. They needed to constantly replenish the hydromel.

The Vanir's employers, Terminus Inc, used the hydromel in order to keep them working at Terminus, since they would cut off their supplies if they stopped obeying. (TV: Terminus)