After Adol is framed for murdering the King of Altago, he is sentenced to death by fighting in the Colliseum. He is pitted against a Titano class monster and expected to die, fitted with only a sword and a shield. Scias offers him a healing potion item to help him in his fight.
What makes this battle awesome is that it harkens to the previous Ys games where Adol battle would against powerful bosses solo, and in Seven's case, the battle is set to the Crossing Rage theme making the fight even more awesome. Bonus points if you manage to win the fight without using the healing item.