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 :

• Grave of the Undying

  Increase purify chance by 8%, but decrease agility by 15.
• Charming Aura (Black)

  2012 Valentines day limited aura, increase critical chance 2%.
• Tail of Jyubi

  Forged with chakra of the legendary tailed beast, Jyubi. Increase attack damage by 15% but reduce max. CP by 30%.
• Carnival Taiko

  Play the Taiko in Ninja Saga Anniversary Carnival! Recover 5 HP and CP at the start of every turn.
• Dragon Crucifix Spear
• Mech of Battle Gear

  Increase critical chance 3% and critical damage 8%.
• Raijin Raijinco
• Universal Saber

  Increases users agility by 1. Recover 150 HP at the start of every turn.
• S18 Kamimachi Lantern

  Increase 4% critical rate and recover HP by 1%.
• Paper Envoy of God

  Increases attack damage and reduces damage received by 4%
• Ramen Shop Lantern
• S49 Serpent Dragon Chakram

  An exceptional weapon crafted with serpent and dragon remains. Increases agility by 1 and accuracy by 7%.
• Charming Aura (Red)

  2012 Valentines day limited aura, increase all damage 2%.
• Griffin Thunderball

  Increases critical rate by 3% and dodge rate by 3%.
• Sanmoku Gourd

  Reduce damage taken by 65.
• Blood Brush

  Increase 3% damage and increase healing power of scrolls by 10%.
• Tailed Beast Chakra Crystal

  Increase 3% damage.
  Reduce 3% damage taken.
  Recover 2% HP each turn start.
• S11 Tensho Compass

  Increase attack damage by 4%, and recover HP by 1%.
• Charming Aura (Pink)

  2012 Valentines day limited aura, reduce damage 2%.
• Blue Cloud Umbrella

  Ignore 6% targets dodge.
• Emblem backpack (Yellow)

  Double mission XP reward in level 1 to level 20.
• Ghost Spider

  Reduce 72 HP damage taken.
• Call of the Angel

  Reduce damage taken by 100. Has 6% chance to convert damage taken to HP positively.
• Hidden Green Umbrella
• Sealing Pot

  Increases Max. HP by 4% and recover 3% HP at the start of every turn.
• Gunbai: Gyoji
• S10 Kikyo Umbrella

  6% chance to convert damage taken to HP positively.