in the ice castle in chapter 2, there is a woman (i don't remember her name) that becomes invisible after she brakes her staff.
how can i kill her? i don't seem to damage her at all after she gets invisible
If it's the one I think highlight: Go to the room with the battle square and change the switches to the mode that makes you etheral (inner sanctum). Maybe you need to talk the mage first before you can do so. Fight her in etheral state and kill her, then change back.
the invisible woman (spoiler) 
Linear Mode
