The Virus

When the government found a wounded Krycheck demon walking around in the desert, they somehow managed to capture it. As part of an experiment they injected him with a human blood sample. However, the demon-human blood mixture created a virus which spread over magical creatures by scratching, killing etc. as long as the blood of both demons or other creatures where mixed.

Ater infection the wounded will undergo a gross physical transformation similar to the one Jade Demone experienced when turning into Hecate, effectively demonizing them as it were. The patient's will also become highly agressive and can easily work themselves up into a frenzy. However the person still essentially retains their personality and all their powers. In fact, they will also be subjected to a huge power boost whilst in this state to the point where even kicking or throwing a demon will be enough to vanquish it. The being also becomes almost invanquishable as each time they kill someone they gain their powers (if blood is mixed). The only downside to all thsi is that shortly after the demonization stage the patient will revert back to their ordianry form and quickly die.

The only way of curing the virus is to locate the donor of the human blood and inject it into the infected.