Maybe we not kill Krystal yet. Have her be a bad guy sorta thing. Like Nicholas from Alexandria but not scared of everything and we have to kill her then. I just see ways we can use the character to make strife within the group. We can adjust her and just establish her as a short time NPC. Maybe have her and someone go to the military base I mentioned in mine and Demons Collab. We can easily use that character for a lot more then just killing her off.