Ok so basically we have 4 options for Shiver that have been discussed:
A) Shiver and Ravanna are completely different people
Problems:
1- Did Soulblighter summon them both through Tramist's Mirror? It seems unlikely.
2- How do Fallen Lords of this much power keep themselves hidden from the world?
Solutions:
1- No viable solution to date
2- If Ravanna is a stealthy nightwalker as "Loveless Daughter of Unwed Dawn" could be taken to imply, then she might be able to hide herself well.
B) Shiver is Ravanna Reborn, Ravanna is Ravanna Revived
1- How can someone be reincarnated without dying?
2- This would mean that Ravanna is still running amuck, how could this go unoticed?
Solutions:
1- Perhaps "eternal sleep" means that one's body remains alive but one's spirit leaves it thus making it possible for one to be reborn.
2- Ravanna fell back into her eternal sleep after Balor died OR see A-S-2
C) Ravanna and Shiver are two sides of the same person/ two spirits in the same body
Problems:
1- Who is in control of the body?
2- Why would Shiver take offense at being called Ravanna?
Solutions:
1- Shiver (or perhaps Shiver during the day, Ravanna at night as her name implies?)
2- Perhaps Shiver and Ravanna have conflicting personalities and therefore dislike eachother's presence or perhaps knowing that they are one and the same makes Shiver vulnerable to some kind of magical attack.
- The Happy Child of Un-Full Udders