itch.io

Probably a typo. 

Warlocks are (from what I understood playing the game) connected to a divine but while priests and priestesses are trying to limit said divine's madness -Xiris in Mc's case- warlocks are the result of their madness which makes them vastly different from Mages.  

So I don't think the term warlock here is the same one we use to say male spell-caster. 

Because this story is set in fantasy world so meaning of some words can be interpreted differently from real world.

The prime example is D&D, where warlock is not a male witch but a magic user who made a deal with otherworldly beings.