The Spirits Of The Past possess a well-rounded team with significant advantages in both offense and defense. The Holy Blade’s immunity to debuffs means the King, as their leader, can always remain effective, avoiding any negative effects from Kris's abilities like Lullaby Song. Additionally, the Valorous Order ability grants all allies a substantial boost (+50% Str, Def, & Initiative), which would enhance their overall combat capabilities significantly. While Kris, Susie, and Ralsei have strong abilities, particularly with defense and healing, the sheer power of the King’s Slaying Edge (300% DMG) combined with the support of the other spirits (like the Sergeant creating critical hits) would likely overwhelm the enemies. The synergy in the Spirits of the Past’s team, especially the combination of potent offensive moves from the Sergeant and Cavalry, with defensive measures from the King and the Vanguard, creates a scenario where they can sustain damage while dishing out heavy attacks. Therefore, Opponent's team would likely emerge victorious.