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IGN highlights the strengths and weaknesses of the Nightmare bosses in Ni No Kuni: Wrath of the White Witch on PS3.
Nightmares are the personification of a heart broken characters despair. They're incredibly strong in dark magic, though this also makes them weak against light. They'll use spells and attacks that not only cause physical damage, but also are capable of inflicting curses, nixes, blindness, sleep, confusion or poisoning upon you and your party.
Use your most powerful light magic attacks to defeat these foes (i.e. Mighty Light, Twinkle Twinkle and Arrow of Light), and make sure that you're well stocked in mana-restoring items and affliction cures (Curse-B-Gone, Poison-B-Gone, etc.).
Ni No Kuni: Wrath of the White Witch - Boss Battle Strategy: Nightmares