You might as well compare with these Back Items so you can decide which Back Items you're gonna use for ninja Saga Pvp or in Hunting House for easier killing the boss or your opponent in ninja saga PvP
These Back Items might have better effect . Here we go :

• Swire Raijinco
• Toxic Mushroom

  Increases damage by 10% but the user takes 200 HP damage every turn.
• Charming Aura (Red)

  2012 Valentines day limited aura, increase all damage 2%.
• Stuff Bunny

  Increase Max. HP by 2% and Max. CP by 4%.
• Dark Secret Seal

  Increases critical chance by 4%. Has 12% chance to Restrict anyone who attacks the user.
• Shinobi Curse Battle Umbrella
• First-Aid Kit

  100% of the purchase price will be donated to Japan earthquake relief.
• Scroll: Kinjutsu I
• S49 Serpent Dragon Chakram

  An exceptional weapon crafted with serpent and dragon remains. Increases agility by 1 and accuracy by 7%.
• Turkey Tail
• S14 Yabusa Knife

  Increases 4% attack damage and ignore 4% of targets dodge.
• Christmas Bag

  Reduce damage taken by 10.
• Paper Envoy of God

  Increases attack damage and reduces damage received by 4%
• Great Wooden Hammer (7 Days)

  Increase healing power of scrolls by 50%.
  Reduce 8 HP damage taken.
• Jingle Bell

  Reduce 2% damage taken. Recover 3% HP at the start of every turn.
• Deadwood Pipa
• S55 Mirror of Fantasy

  Increases damage by 6% and accuracy by 5%. Has a 7% chance to convert any damage taken to HP.
• Choco Tama

  Increase accuracy by 5% and increase healing power of scrolls by 25%.
• Scroll: Grassland
• Blessed Kitty

  Bless on his master everyday, which increase 3% damage. Heal 1% HP in every turn.
• S81 Wheel of Glory

  Reduce damage taken by 200. Increase Combustion chance by 15%. (Minimum requirement of 1 Attribute Point in Fire to activate combustion effect)
• Angel Heart (White)

  16% chance to absorb 2% HP of enemy who attack you.
• Patriot Aegis

  A mythical shield that can block even the most vicious attacks. Increases max HP by 3%. Has a 60% chance to recover 5% of maximum HP and reduces damage taken by 75.
• Radish Launcher

  It will fly you to the moon! (Easter 2011 Limited Edition)
• Chakra Message Stick
• Sakura Rain Battle Umbrella
• Ramen Shop Lantern