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 :

• Carp Flag
• Cheerful Snowman

  Increase Max. CP by 20%. Recover 2% HP at the start of every turn. but reduce max. HP by 12%.
• Grand Light Gourd

  Increase 3% damage
• Wooden Repeating Crossbow
• Scroll: Genbu
• Dark World Hammer
• White Metal Hammer
• Shinobi Curse Battle Umbrella
• S12 Ancient Blood Evil Gourd

  Increase max. HP by 5%. But reduce Max.CP by 1%.
• Raijin Raijinco
• Dark Evil Sickle

  Exclusive Halloween item - the devils sickle that has 10% chance to absorb 1% HP of enemy who attack you.
• S51 Enchanted Winged Carapace

  Increases accuracy by 3%. Recover 4% HP at the start of every turn.
• Horror Scarecrow

  Increase attack damage by 5%. Reduce damage taken by 150.
• S14 Ancient Yabusa Knife

  Increases attack damage 4% and ignore 3% of targets dodge.
• S11 Wood Spirit's Bow

  Increase critical chance 13%.
• Ghost Spider

  Reduce 72 HP damage taken.
• Red Shell
• Smoothbore Musket

  Increase 10% damage.
  Reduce 3% damage taken.
• S8 Scroll of Golden Snake

  Increase all attack damage by 4%. Decrease damage taken by 4%.
• Falcon
• Light Cry Raijinco
• Paper Umbrella

  Increase dodge by 3%. Reduce damage taken by 80.
• Mech of Battle Gear

  Increase critical chance 3% and critical damage 8%.
• Peom Fan

  Reduce 46 HP damage taken.
• S15 Seitenken

  Recover CP after HP reduction. (Amount: 20% of HP reduction)
• Ancient Shinobi War Decorated

  Additional 60 HP damage upon all attack.
• Folding Fan: Shino