04 - Infection (T-Apostle)
Silas' main reason for visiting Romania was to look for his sister; however, he was also tasked by his handlers with recovering either a sample of the Black God mold or the cadou parasite.
The time between Silas' infection with E and his resurrection was very short, as was the time between his resurrection and Eveline's subsequent death. As a result, the bonding process stalled and Silas did not succumb to the brainwashing effects as there was no relevant focal point. This along with his T-Apophis vaccination preventing a violent rejection means Silas has most of the benefits of mold infection and few downsides.
Silas is not only immunized against runaway mutations, but also given an avid deterrent against predation by mold-derived bioweapons, who will become infected by T-Apophis if they are exposed to or ingest his blood. The Lycans who attacked Silas in the Romanian village were exposed to T-Apophis which quickly killed them. Like a toxic species causing predators to learn to avoid them, Silas' encounters resulted in the Lycan population giving him a wide berth.
This created an ideal scenario for further experimentation. Securing a cadou parasite from the Duke wasn't easy, and required collecting quite a sum of money and trade-able goods. This as well as looking for his sister took up the majority of the time Silas spent in the Romanian village.
With help from certain allies, Silas was privy to several discoveries. The first study was recursive interactions, splicing the original Black God mold with samples of the E-Type cells making up Silas' body, along with the A-type cells, and introducing the T-Apophis virus to see what would happen. The results produced a lot of mess along with a few useful bits.
From the bacteriophagic virus T-Apophis, which specifically targets mold from the E-series and attacks cells expressing traits that result in host mutation, arose T-Apostle. T-Apostle is a more potent version of the virus that compels mold cells to seek out uninfected mold colonies and spread it further; it also doesn't inhibit the horizontal gene transfer the way the original virus does. Infectees of mold cells who in turn are parasitized by T-Apostle will try to spread their condition.
T-Apophis, and T-Apostle with it, are only benevolent to mold cells not expressing runaway mutations, and begin multiplying and eating cells that do. As such, they are invariably lethal to mold hosts who have already mutated; however, T-Apostle is slower-acting, more infectious, and harder to detect, giving infected mold-derived creatures time to spread it to others through infighting, sex, or common everyday interactions. Cadou parasites and eggs are not immune to this, and will succumb to the virus' effects even more quickly. Silas' blood, through this exposure, has become a catastrophic chemical weapon that can easily wipe out large mold colonies, while being completely inert in uninfected humans.
It isn't perfect, however. Rarely, mold-infected individuals can survive the cellular breakdown stage of T-Apostle and live to spread it further, while being severely weakened.