Danny's blood is valuable, and any occultist would kill to get their hands on it.
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It's why the GIW is so desperate to lock down Amity Park, why they're so desperate to capture any ghost they find. They say it's for experimentation, because like hell are they gonna let the mayor or the Fentons know what it can be used for.
All the ghosts they capture are in containment wards, for their and everyone else's safety.
The blood of any being from the Infinite Realms is a 100% guaranteed method of getting a god's attention, of getting them to agree to do what someone wants.
The blood of an Infinite Realms being can be used for incredibly destructive purposes, as gods will literally do almost anything for a taste of it.
The GIW used to let the humans of Amity Park leave, but after multiple medical checkups, realized that Liminal blood was almost as good as Ghost blood.
Now, no one is allowed to leave Amity Park, full stop.
John Constantine has been contacted via magic by a girl named Samantha Manson, desperate for someone Justice League affiliated to save them.
But the more John looks into the town, looks into what the GIW is actually doing, he realizes this is just more shitty luck for him; because he actually agrees with the GIW.
Infinite Realms Denizen blood is a rarity so rare it's considered a myth, and effective enough to make Darkseid bend his knee for it.
It's way too dangerous for Amity Parkers to leave; they'd be hunted and killed, and the world would suffer for it.
John...John let the kid know. That he'd be helping the GIW and creating wards around the town, so that no one could leave.
This makes things very awkward when Phantom, of all things, manages to leave somehow, and from his skewed perspective (because apparently John didn't explain well enough and the GIW didn't explain at all) get John on trial for expulsion from the Justice League Dark, all while his idiot coworkers are trying to break into Amity Park to "free" the people inside.
