In the books, the sorceresses use various spells and don't seem to be tied to any element in particular. Actually, I've always been confused as to why Triss uses fire spells, since in the books Yennefer says that drawing magic from the element of fire is extremely dangerous and should never be done.
Must be for gameplay pyrotechnics (slight pun intended). Is it ever hinted that any of the sorceresses
favor a specific element or is just whatever you need in the moment to get the job done? I guess while I'm on this, I wanted to ask a couple more questions about Sapkowski magic: is it sort of an open ended magic system in that it isn't strictly defined by a set of rules (i.e elements/mind, etc.)? Is the only limiting factor energy? I guess that's all I can think of at the moment. I'm still working my way through the books, so maybe all these will be answered in time.
PS: I'm getting an X-Men "Storm" vibe from that Gwent artwork. Even her eyes have 'gone white' while channeling.