Seen from afar, the violet Malice shrouding Hyrule Castle surges.

Boiling out of the mist is a thing of rage and hatred. It flows into shape from the violent energy, bearing no concrete form but amber eyes, a gaping maw, and hooked, boarlike tusks. Its wordless scream projects across the land for miles and miles, striking unnatural dread into all who hear, summoned demon no exception. It's a sound of anger, of confusion: above all else, of hate, blinding and immortal. It climbs, winding around the castle as if grasping the cracking towers on invisible limbs. The sky blackens and the dawnlight fades and the moon bleeds red and full, and the air sparks with motes of cold heat—

And a golden star pierces through it.

It burns brighter and brighter, through the winding silhouette of the beast, through the haze. The thing howls as it's torn through inside out, and it fights, but to no avail.

Over long seconds, the Malice collapses back to its the formless soup-haze, still boiling over, but quelled.

For now.

The golden light flickers and dims, spent, until at last it, too, winks out. The sky bleeds back to the hues of early morning. The castle is still cloaked in its evil haze.

...Right, where were we?

Well, Cam was tumbling through the air trying to stabilize his flight versus that explosion. What the shit, why would it explode when he got it down to fine particles? What does that? Even if it were for some reason made entirely of sodium there wasn't that much water around!

He ultimately manages to catch himself before hurtling into a tree. Is there anyone currently in lava related danger or anything.

Did he successfully liquid nitrogen all of it? Does he wish to continue liquid nitrogenning all of it?

The volcanic crater is now significantly larger and a bunch of rock went flying, which he cannot possibly track at this point, but the actual flow of lava and volcanic activity is indeed waning, as far as he can see. He doesn't see anyone in lava-related danger, but his unobstructed field of view is very small compared to the total surface area of the volcano; the surface is very craggy.

He makes a little model volcano. Anything flowing towards inhabited areas?

Nope! Most of the structures he sees on the model are around  the lower altitudes of the volcano, and if he's scale-modelling with material substitution for meat that makes it obvious where they are, so are the people. The excess lava largely collects in the pre-existing mid-altitude lakes and rivers and is probably contributing to some surge in flow levels further downstream, but there aren't any new downstream flows or suddenly overflowing riverbanks or anything.

Oh good.

He will continue on his way and mostly avoid the magic robots if they let him. Too damn explody.

After he's past the crater, now conveniently free of hostile magic robots, the environs cool down quicker than the opposite on the approach.

He'll come across some odd-looking camps nestled in the volcanic rock spires on the east side of Death Mountain, made of scrappy wood and salvaged material. They showed up in his scale model, but in real life and full scale, it's more apparent that the figures inhabiting them might be yet a third... fourth? type of novel sapient species. They come in different colors and have a small and squat variant, and a large and lean variant, and they have primitive clothing and tools. They don't notice him as he passes, possibly because a lot of them are in uproarious conference, possibly about the giant explosion that just passed over their head.

Once he hits the Akkala Highlands, it's smoother sailing. Another couple of stables, people and carriages on the roads, small settlements, farmland here and there—population is sparser than it should be, and signs of old destruction and abandonment are about, and a lot of the folks he glimpses again appear a little harried, but it's not the ruinous post-apocalypse one might picture.

Kaneli's pointers weren't exactly a postcode and street address, but if Cam finds the coast and follows it north, he'll eventually catch sight of what looks like a retrofitted lighthouse near the end of a cliff, bearing a large telescope pointed south west, and various lesser installations reminescent in construction of the magic robots and the Sheikah Slate.

Hopefully none of them will shoot at him.

He looks for a place to land and settles on the cliff to knock on the lighthouse.

He is mercifully unshot.

No one answers.

Someone's clearly home, though. He can hear someone banging around and cursing inside.

Perhaps it's very cluttered in there and they don't often clear the path to the door. He'll give it a minute.

Nope! Whoever it is is talking to himself. There's also a female voice now and then.

KNOCK KNOCK.

Two seconds pass.

"WHAT IS IT?" yells the male voice from inside.

There are approaching clatters, and after a few seconds, the door flings open. A short man with huge white tufts with a pair of odd goggles stands in the doorway, incensed, holding a long and thin looking-glass sort of instrument. Behind him is a cramped workshop in disarray.

"Something very important has just happened, and I need to figure out what! If this is about the new... lens..." He trails off as he finally absorbs who he's looking at. "Now what are you?"

"I'm a demon! My name is Cam."

"What's that? State your business! I've got important things to do."

Cam makes a new Sheikah Slate. "Can you make this work?"

"WHERE DID THAT COME FROM?!"

He attempts to pluck the Slate out of Cam's hands and turn it around. "Where did you get this? It's in perfect condition..." He prods the screen, then holds down a combination of buttons on the rim. A series of mechanical clicks sound from inside the Slate. "Out of power. How did you manage that? No, no, I must resist!"

He shoves it back at Cam.

"Come back tonight—no, tomorrow! I need to gather this data. There's been a magnificent flare of phosphoric energy in the aether. Nearly took out half my instruments! Regretting turning Purah down about that Guidance Stone, now, but she's in a much worse location to characterize it. This could be an incredible leap for Sheikah Science!"

"...did your flare of phosphoric energy possibly coincide with that explosion at the volcano thataway, that was me."

"It came from that direction, certainly. Now what did you do?"