Quote Originally Posted by TheCountAlucard View Post
They can make a new demon, but it's not the same demon, except in the sense that the son you have to replace your son after your son dies is the same son.

That said, a demon that's "killed" can be brought back by a cult if it has one, but that's more a case of being Only Mostly Dead as opposed to resurrection.
And for first circles, it's cult or nothing. They're more akin to elementals in that they disperse instead of reforming.