User blog comment:Rafe Adler/"Byzantium" Discussion/@comment-74.132.82.188-20181208174101/@comment-1031724-20181208192925

Indeed. She was at least full nephilim, Jack lost his grace so he was human when he died, which could be why he went to Heaven. After all, monsters that were transformed from humans still go to Purgatory on death. It all depends on what they are at the point of death whether they go to heaven or hell (humans), the Empty (angels and demons), or Purgatory (monsters).

Metatron was human when Amara killed him due to losing his grace. Is he in the Empty, or did he go to heaven or hell (depending on whether his post-redemption actions counted there, as Lily's final act did). Same with Castiel when Lucifer killed him.

Probably Jack instance was the only one noticed by Cosmic Entity since he was awoken by Lucifer's awakening in the Empty soon before. That can't be coincidence. Though it is an interesting question about the Nephilim Castiel killed. Like Jack, she'd have angel grace but a human soul.

Cosmic Entity's a dick of course. Jack's half human and has a right to go to Heaven, Cosmic Entity just used his being half angel as an excuse to put another soul into the Empty, and wants Castiel to suffer more by killing him at a moment most inconvenient for him.