Eda pretty much accidentally rescued King from a possible very early infanticide by taking him to the Owl House, far away from the sea and trappers.
The Titan trappers were essentially just wearing children's skulls on their heads, given how small they are.
The skulls might be fake, given Bill's comment on King's realistic "costume." The skulls in the shrine have a much more consistent design.
Looks like King really is the King of Demons, but as a dead one. As explained in "Knock, Knock, Knockin' On Hooty’s Door", demons are born from decomposed Titan's flesh, which means if King dies, he will create new demons from his body.
Since King is the last living Titan, Luz can use his blood to go back home. The issue is that Luz is not the kind of person that would harm what she considers her surrogate little brother.
On the other hand, a simple medical blood draw done by a knowledgeable healer (possibly Viney) with King's consent could very well be on the table, after all injuring someone is not the only way to get blood from them.
And King has already given a blood sample to take a test to discern what kind of demon he is. A pretty sizable one at that.
However, who's to say that Belos won't be interested in taking blood from him? And he could either kill him, or keep him imprisoned as a living blood bank and possibly tortured.
It’s a good thing Hunter left while he still could, because his former buddies just came to the Owl House to arrest all occupants for invading the Emperor’s mind.
Given that The Collector is revealed to have enjoyed the company of baby Titans and King's dad regrets that he harmed an innocent instead of the beings responsible for his people's genocide... it's likely that mirror wasn't connected to The Collector themself, but instead one of their siblings.
