The way to use Light Nike is to spend the first 10 turns charging blessings, then the next 10 turns charging ATK ups. After ~20 turns, you'll have full or near-full ATK buffs and a 1 Full Burst charged, allowing you to double Burst with +100% ATK (~+45% damage = free Provisional Forest) one time. That would be how to deal with one of those final bosses with a very slow-moving Rage bar that dies after 1 Rage phase (and has a deadly Rage Overdrive).