Deflux

Deflux is a decease created by Lexx, and Var'Lek that affects dragonborns. The aim of Deflux is to "improve" dragonborns so that they would be more like dragons as opposed to humanoids. Lexx created Deflux and used the population of Vir'Tol as his test subjects. Since dragonborns all around were getting sick and started dying due to the decease, he came up with anti-Deflux potion.

The anti-Deflux potions supposedly cure the decease, but did the exact opposite, it containted the most recent changes to the serum as to keep experimenting on dragonborns with the most recent variant. These anti-Deflux potions were sold for an extremly high price, and since dragonborns were desperate, were spending their life savings on these potions. This is what funded Lexx's research and experiments.

An end was brought to Deflux when Vianova killed both Lexx and Var'Lek, and found a cure to the decease. Later, Varis spent time brewing the real cure and started distributing it in Vir'Tol, curing many ill dragonborns in the process and saving many lives.