Cam is watching a new recording of Atriama, tail swishing in the gap in his couch, and doesn't stop to pause the show when he feels a summons go by.
I don't suppose this is just all delusions of importance on your part and she doesn't actually care about either of us?"
"I replaced Kyushu including everything that was there pre-Leviathan minus the vertebrates and contents of refrigerators, you tell me, do I seem like I might interest the Simurgh?"
"So you can see why I'm concerned. I am not in personal danger of death; but I'm here to do good and if anybody could get me doing more harm than good it's her; so if she's going to extort me I need to be non-extortable."
"And this works? She still could threaten to kill me, if anyone can reach this far it's her."
"I'm not going to make any more things on her say-so. Getting anywhere farther than Mars would take ages, and if she can and will chase you to Mars there's no reason to expect Titan to be out of reach. Would you like me to put you in an autopiloted spaceship on a trajectory of 'away' until and unless I or someone figures out how to kill her, instead?"
There's really no way out of this, is there. As long as I'm being stuck out here, you better at least make me an entire Taj Mahal or something."
Cam doesn't go straight back to Earth.
When he's about halfway there he pauses to make Endbringer bits in a sort of exploded diagram.
He wants to know what they're made of.
The monsters have no internal organs. What they do have is layers. The flesh gets progressively tougher from the skin down to a core, and even the outer layers are relatively indestructible compared to what they have any right to be. Between the lack of vital organs and the Endbringers' known regenerative abilities, the entire visible body is probably just some combination of armor and decoration.
He goes through his chemistry notes to see if anything would like to energetically dissolve this stuff.
No silver bullet reacts unusually with pieces of Endbringer. It's pretty inert. The stuff can be destroyed by anything that would usually be destructive, but it gets exponentially harder to damage closer to the cores.
Well, he's in interplanetary space. How does a bit of core react to a pinhole singularity, surrounded by enough magnets of the sort that handles his home garbage disposal to prevent it from running off and eating asteroids?
Nothing much happens. The bit of core falls inward, appears to stop just before reaching the event horizon as per normal, and doesn't even spaghettify.
Cam tries more things - intense heat, more fun with chemistry. At one point he puts a bit of core in his mouth and bites it hard enough to chip a tooth if it won't go.
It doesn't go, but that's no surprise. He can only provide so much force, and this material already shrugged off worse. Nothing has any perceptible effect on the pieces of Endbringer core. At least the tooth doesn't chip unless he wants it to. Two can play at the indestructibility game.
Cam flies back to Japan. He writes up all his findings on the way, notifies the Prime Minister that he thinks he's contained the problem, puts up his experimental results on the Internet, and gets back to what he was doing.
Where the cores are is one thing everyone's glad to know. Especially in the case of the Simurgh; apparently her humanoid body is nothing more than a decoy. The level of indestructibility they're up against, less so. Publicizing that might very well decrease defensive turnout. (No one tries to de-publicize it. Can't stop the signal.)
Cam makes sure there's an email address available for anyone who's thoroughly investigating the research to let people suggest things.
Not a lot of suggestions, but some people would like pieces of Endbringer for testing against promising powers. Quite a few groups would like that, in fact.
The Protectorate asks for the most samples, of course; the enormous North American hero team has the most comprehensive access to allied capes. They strongly recommend that Cam either be selective about sending it only to heroes or be very clear that use of this material falls under the Endbringer truce. There could be any number of powers capable of using this resource as a stoppable force multiplier. But the truce is regarded as inviolable; if Cam declares that this is only to be used against Endbringers and the Protectorate publicly agrees then other groups will follow.