A state of extreme violent psychosis, and the ultimate fate of many of those who suffer from the curse of voidtouch, i.e. those who have come in contact with Versa.
A person in frenzy spends the rest of their short life attempting to kill everyone around them.
If a person does not immediately frenzy upon coming into contact with Versa, they become voidtouched, which allows them to cast magic. However, they are forever at risk of entering frenzy later. This is the reason why voidtouched people live controlled lives in most nations.
There is no cure to frenzy. Once a person enters frenzy, they can never be recovered.