Just a thought. Given enough heat, even metal and rock will boil.
The scryer merely said "Boiling" so maybe she's not really limited to just boiling water or bodily fluids.
Her seemingly useless power turns out to have a lot of potential lethal applications, given enough "creativity".
And...
I didn't recognize Nikki at first... she's changed a lot from wild child to disciplined martial arts disciple
Damn, this chapter wasn't enough... I wanna see the 4 heroes' reaction to how strong our MC has become since they last met a long time ago