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 :

• Scroll: Posion Attack
• Training Dummy

  Increases accuracy by 5% and dodge rate by 4%.
• Justice and Freedom

  Flag of the United States of America which symbolizes freedom and liberty. Recover 3% HP with every charge. Increases critical rate by 3%. Reduces damage taken by 50.
• Moai Flagon

  Increase Max. HP by 3%. Reduce damage taken by 100.
• S7 Gorgeous Butterfly

  Increase agility by 2. Recover 20% extra CP when charge.
• Love Ribbon

  Additional 40 HP damage upon all attack.
• Blue Shell
• Ninja Bunny Doll

  Increase 2% damage and ignore 3% targets dodge.
• Neptunes Healing

  Amazing power from Neptune. 3% chance to convert damage taken to HP positively and recover 3% HP at the start of every turn.
• Chakra Magatama

  Increase 2% accuracy.
  Additional 5 HP damage upon all attack.
• Toxic Spider Web

  10% chance to apply Restriction on enemies who attacks the user for 1 turn.
  5% chance to freeze enemy who attack user (1 turn). Frozen target cannot move but damage taken is reduced by 80%
• Sakura Straw Hat

  Recovers 2% of users max HP every turn.
• Red Shell
• Wood Top
• Writing Brush
• Scroll: Grassland
• Spirit Flag

  An inspiring banner that boosts the holders morale. Increase critical chance and dodge rate by 3%.
• Sakura Lucky Cat

  Ignore enemys dodge rate by 4% and increase 3% dodge rate.
• Ninjas Stocking

  Increase 5% Combustion chance and attack damage by 3%.
• Rose Bouquet

  Recover CP by extra 5% per charge
• Silver Torch of Zeus

  Increase mission gold reward by 300.
• Firefox Tail
• Large Wooden Hammer
• S5 Umbrella of Spiritual Pulse

  Recover CP after HP reduction. (Amount: 10% of HP reduction) Recover 5% CP every turn if current CP is less than 50%. Has 8% chance to reduce skill cooldown by 1 turn at the start of each turn. (Not effective on talent skills)
• S10 Frostguard's Shield

  Shield of the valiant warrior Tundra. Increase agility by 2. Has 17% Chance to stun target when attack with weapon for 1 turn.
• Deadwood Pipa
• S8 Underworld Bulwark

  A phantom shield with demon soul. Reduce damage taken by 10%.