Luna DLC
The DLC would start in or around Insomnia post-Kingsglaive. There is no ascension/skill tree to upgrade or max out. Luna starts with full health and stats. Max HP degrades over time. Battle encounters are limited or nonexistent. It's more about stealth/diplomacy to handle bad situations. She travels alone for the most part with guest appearances by such characters as Iris and Monica. Pyrna stays close upon reaching Duscae. Umbra pops up from time to time. Noctis' responses in the notebook carry over.
While traveling from place to place forming covenants with the Astrals, she can interact with NPCs: heal starscourge (kind of like the broken down car mini quests), strengthen the protective area of outdoor havens, learn backstory and lore, etc. After completing a certain amount of side quests a new area is unlocked in the main game for Noctis and his posse to explore for even more lore. Perhaps unlocks an explorable Tenebrae after chapter 9. However, the more time taken to complete main story quests the faster HP drops. At best she can reach Titan with half HP.
