To unlock Eidos 9 in Stellar Blade, ensure Lily's progress is at 100% after Abyss Levoire. Failing to do so will skip Eidos 9 and head to Spire 4 directly.
Completing NPC quests, obtaining collectibles, and preparing with specific items like the Sky Ace outfit are essential before reaching the point of no return to explore Eidos 9.
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