Had both my first game crash and ramming of the damage cap while fighting the level 20 legacy boss. Not that the fight itself was hard to redo at my level.
Numbers Edit: Using Bravely Second, I managed to inflict 13426 HP worth of damage with a single attack. The conditions involved my level 34 AgnÃ©s as a level 8 Ranger armed with an Angel's Bow, Red Cap, Mirage Vest, and Power Bracers, having set HP +10%, M.Defense +10%, and P.Attack +10% abilities, using the Rapid Fire special with Fire, Flier Slaying, and Poison Touch parts after the previous turn was used to Invigorate up to 150% PAtk and add Haste.
Double Edit: Make it two crashes.