staff shield vs heat

“Not yet!” called Ascher in a panting, tense voice, as Nicodemus stepped toward the Way. “Give it a couple of minutes to cool off!”
I waited about forty-five seconds and then muttered a spherical shield into life around me, channeling it through my staff. I would rather have had my old shield bracelet, but assembling a decent metalcrafting tool shop takes money and time, and I hadn’t had time to rebuild much of either—and certainly not to the degree I’d been prepared back in my old lab at my apartment.
The spells I’d carved into the new staff were much the same as the ones in my old shield bracelet, if less efficient and less capable of tightly focusing power, but it was much better than I could have managed without any focus at all, and it was sufficient to protect me from harm as I crossed the still smoldering-hot ground.
Passing from the mortal world into the Nevernever is both more and less dramatic than you’d think. There’s no real sensation to it, apart from a mild tingle as you pass through the Way itself, kind of a protracted shiver along your skin. But when I stepped into the Underworld, I knew that I had just crossed an unimaginable distance. My body felt slightly heavier, as if the gravity itself was different from that on Earth. The air was hot and tainted with sulfur and other minerals, and it felt utterly alien in my nose and mouth. The ground around me was all stone, covered in protruding chunks of what might have been still-glowing charcoal, and I could see the melted stumps of what must have been, at one point, stalagmites, their limestone now running like candle wax. Shattered, half-molten remnants of what must have been stalactites fallen from a ceiling out of sight in the darkness overhead were scattered around my line of vision.
Of course. We were in a cave. An unthinkably enormous cavern that stretched out of sight in the glowing light of the Way behind us and that was interrupted by a wall at least forty feet high and the archway set into it in front of us.
I crossed the ground rapidly to Ascher’s side. My shield was good when it came to stopping fire, but it probably wasn’t quite as good as a single one of the layers she’d held in place around her. “Hey,” I said. “You all right?”
“I was sweating,” she said, her face twisted with pain, and she lifted her hands to show me blisters bubbling up in a line along her palms where she had grabbed the lever. The lever itself still glowed red with heat that it hadn’t yet lost. “Dammit. The sweat went into steam and screwed up the last few layers of protection.”


Skin Game Chapter 37, Page 313-314