1. There is a hydrant to the left of the shrine’s entrance. Hit it with any weapon to activate it and then pick it up. 2. Take it near the lava bed and spray water on it to create a lava slab. 3. Keep carrying the hydrant and create lava slabs to move to the next section....
As it continues to boil, you'll see the the temperature rises much more slowly now. (Don't use that as an excuse to leave, though... please stay and watch it for your safety!) You'll also notice that the steam dies down as the water goes away, and soon there is no steam at ...