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 :

• S15 Frozen Large Sword

  Increase 7% purify chance.
• S16 Umbra Steel Wheel

  Reduce damage taken by 270.
• S27 Golden Gourd

  Recover 5% HP with every Charge.
• Mini Evil Wing

  Exclusive Halloween item - the devils wings that frighten enemy, and hence reduce their damage done on you by 5%.
• S42 Tendo Tips

  Increases attack damage and reduces damage received by 5%.
• S66 Dark Wings

  Remnants of a powerful dark spirit. Increases attack and critical rate by 4%. Increases accuracy by 5%.
• S18 Kamimachi Lantern

  Increase 4% critical rate and recover HP by 1%.
• S9 Warring Empire Guarding Bow

  An ancient enchanted bow with great range used in warfare. Increases accuracy by 10%. Restore 100 HP every turn.
• Writing Brush
• Spiked Blade

  Increases dodge and critical chance by 4%. Recovers 70 HP each turn.
• Magical Wreath

  Recover HP by 2% and reduce 4% damage taken.
• S71 Magic Clock

  Increases Max. CP by 10%. Recover CP after HP reduction. (Amount: 20% of HP reduction)
• Harvest Treasure Bag

  Reduce damage taken by 140. Recover 5% extra CP when charge.
• Ghost Spider

  Reduce 72 HP damage taken.
• Scroll: Messenger (7 Days)

  Increase 2% accuracy.
  Reduce 20 HP damage taken.
  Recover 35 HP when each turn start.
• Childhood Memories

  Mothers Day 2011 Limited Edition
• Deadwood Pipa
• Clouds And Mist Raijinco
• War Flag: World Peace
• S10 Ancient Kikyo Umbrella

  6% chance to convert damage taken into health. But reduce Max.CP by 2%.
• 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.
• Nightmare Grudge

  Ignore 4% targets dodge.
• Sealed Wood

  A back item which lost the original effectiveness.
• Wooden Repeating Crossbow
• Red Koi
• S24 Junsei Ring

  Increase max. HP by 5%.
• S68 Supreme Faerie Wings

  Recover 20% extra CP when charge. Has 10% chance to convert damage taken to HP positively.