Hydromel

Hydromel was a vaccine used by the Vanir to stave off Lazar's disease. 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 used the Hydromel in order to keep them working at Terminus, since they would cut off their supplies if they stopped obeying. (DW: Terminus)