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 :

• S77 Curse Dragon

  Increases attack damage by 9% and critical damage 10%.
• Mercy Of Libra

  Recover 2% HP at the start of every turn. And recover 3% HP with every Charge.
• Water Shark Skis
• Gemini Halo Glyph

  Increases damage by 4%. Reduce damage taken by 65.
• S33 Book of Fate

  Increase Max. HP & CP by 4%
• Ichimoku Gourd
• S15 Frozen Huge Sword

  Recupera 26% extra CP en cada recarga.
• Dark World Hammer
• Paper Windmill

  Additional 20 HP damage upon all attack.
• Large Wooden Hammer
• Bell of Beast

  Recover HP by 3%. 15% chance to absorb 3% HP of enemy who attack you.
• Newbie backpack (Red)

  Double mission XP reward in level 1 to level 10.
• Star Dawn Harp

  Increases users agility by 1. Recover CP after HP reduction. (Amount: 10% of HP reduction) Recover HP by 2% when being put on a debuff.
• Smart Phone
• Puppet: Hakuki

  Increase 3% accuracy.
  Reduce 46 HP damage taken.
  Recover 83 HP when each turn start.
• Grand Light Gourd

  Increase 3% damage
• Christmas Chimney

  4% chance to freeze enemy who attacks user (1 turn). Frozen target cannot move but damage taken is reduced by 80%.
• Ronin Straw Hat

  Additional 100 HP damage upon all attack.
• War Flag: World Peace
• 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)
• Yolanda Rescue First Aid Kit
• Hanagara Hagoita

  Increase max. HP by 3%.
• S9 Warring Empire Guarding Bow

  An ancient enchanted bow with great range used in warfare. Increases accuracy by 10%. Restore 100 HP every turn.
• Paper Envoy of God

  Increases attack damage and reduces damage received by 4%
• S12 Ancient Blood Evil Gourd

  Increase max. HP by 5%. But reduce Max.CP by 1%.
• Great Wooden Hammer (7 Days)

  Increase healing power of scrolls by 50%.
  Reduce 8 HP damage taken.
• Champion Cup!

  Ultimate prize for Champions.