Nocturne: Opening Mystical Chests in Nocturne be like...

Shin Megami Tensei III Nocturne HD Remaster Featuring Dante from the Devil May Cry Series presents. “The Kagutsuchi phase affects the chance of acquiring the “rare“ (good) item from Mystical Chests; opening them at Full Kagutsuchi *guarantees* that you will get the good stuff.“ -Sparkster. (Gamefaqs, 2010)