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 :

• S82 Amethyst Skull

  Increase purify chance by 5%. Recover 15% extra CP when charge.
• War Flag: Syoshin

  Increase mission XP reward by 100.
• S10 Ancient Kikyo Umbrella

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

  Increase max. HP by 3%.
• Cheerful Snowman

  Increase Max. CP by 20%. Recover 2% HP at the start of every turn. but reduce max. HP by 12%.
• S31 Yabusa Dual Head Spear

  Increase 4% damage and 4% critical rate.
• S83 Four Wings

  Increase dodge rate by 8%.
• Ninja Snowman

  3% chance to convert damage taken to HP positively.
• S3 Fossil of Magatama

  Increase purify chance by 6%. Has 10% chance to convert damage taken to HP positively.
• S58 Scroll of Shadows

  Increases damage by 6% and dodge rate by 5%.
• Kettle
• Christmas Chimney

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

  Additional 20 HP damage upon all attack.
• Fire Symbol Guitar
• Tailed Beast Chakra Crystal

  Increase 3% damage.
  Reduce 3% damage taken.
  Recover 2% HP each turn start.
• Black Double Gun

  Ignore enemys dodge rate by 3%. Increase accuracy by 3%.
• S13 Slaughter Giant Axe

  Increase max.HP by 20% but reduce max. CP by 35%.
• Businessman Luggage
• S49 Serpent Dragon Chakram

  An exceptional weapon crafted with serpent and dragon remains. Increases agility by 1 and accuracy by 7%.
• Emblem backpack (Yellow)

  Double mission XP reward in level 1 to level 20.
• Crimson Lanterns

  Increase attack damage by 6%. Has 6% chance to convert damage taken to HP positively.
• Cancer Assegai

  Increases critical rate by 4%. Reduce damage taken by 3%.
• Angel Heart (Black)

  Reduce target 8% CP on every weapon attack.
• Dark Evil Sickle

  Exclusive Halloween item - the devils sickle that has 10% chance to absorb 1% HP of enemy who attack you.
• Ice Cystal Raijinco
• Ink Cloud

  Additional 40 HP damage upon all attack.
• Scroll: Double Head