Inarius’ death will result in a new angel being created by the arch. Will this new angel reside in the heavens?
Lilith’s death will result in her being reborn in hell. How long does it take for her to be reborn? Will she be exactly the same?
If Inarius is truly dead he would be replaced the new angel would retain some of his essence and that angel would be in the high heavens. The time frame for this to happen is unknown because the Crystal Arch was damaged. If Inarius was severely wounded and pulled back down to hell the new birth would not take place because new angels replace fallen (dead) angels. 
I am not sure if anyone knows the exact location within the burning hells that is used for the demons to be reborn. In the case of Lilith not only did she die but she also disintegrated upon her death. She was made of flesh and blood nothing is left of her. If she does come back I am sure the demons would have a special place for dealing with her. They had Inarius locked away in the Chamber of Mirrors so they could just lock her away. 
Thanks for this. It will be interesting to see what direction they end up taking.
i dont think the demons would lock lilith away. she has many allies in the hells, arguably more than the prime evils. i mean she is a succubus right?
Are you sure about that.
- She rebelled from her fellow demons to side with Inarius.
- She killed her fellow rebel demons prior to her banishment to the void.
- She wanted to use her offspring to fight the forces of hell (demons).
- Her only allies in the fight with Inarius (D4) were lower level vermin.
Will that help her if a Mallet Lord smashes her in the face. I don’t think so.
yes it will help. she is the definition of a temptress.
Okay, whatever. . . . 