The Adversary by Erin M. Evans is the third book in The Sundering (series) and the third in the Brimstone Angels series. This story continues the trials of the young warlock, Farideh, following the events of Brimstone Angels: Lesser Evils.
Kyuudoushi (仇同士, lit "The Adversary") is a hypothesis developed by Tōshirō Hitsugaya to explain the connections between the recent bout of wars, battles and attempts to destroy Soul Society and destabilize the infrastructure of the two realms. It is believed that they have infiltrated and corrupted a number of individuals, organizations and powers in order to further their agenda, though what their motives are remains to be seen.
The Adversary is a silver sword available in The Witcher 3: Wild Hunt and comes in 3 different forms:
* The Adversary (common)
* The Adversary (magic)
* The Adversary (master)