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 :

• Book of Slate

  Decreases Max. HP by 1% and Increase Max. CP by 10%. Increase 3% purify chance.
• Chakra Message Stick
• Bat Back Item

  Back item design with reference from Halloween - Bats. Increase 5% dodge rate and decrease damage 5% at the same time.
• S69 Skull Cloak

  Increases Max. HP by 4%. Restores HP by 4%. Increase attack damage by 6%.
• Tail of Capricorn

  Increases dodge rate by 4%. Recovers 3% HP with every charge.
• Dark Evil Sickle

  Exclusive Halloween item - the devils sickle that has 10% chance to absorb 1% HP of enemy who attack you.
• Blue Wolf Tail
• Snowflake

  3% chance to freeze enemy who attack user (1 turn). (Frozen target cannot move but damage taken is reduced by 80%.)
• Bronze Torch of Zeus

  Increase mission XP reward by 200
• Prestige Purple Dragon

  Increase attack damage by 5%. Recover 100 HP at the start of every turn.
• Hanagara Hagoita

  Increase max. HP by 3%.
• GM back item
• Tai Chi Gold Gourd

  Restores HP by 4%. Increase healing power of scrolls by 500%. Reduce target 3% CP on every weapon attack.
• Cancer Assegai

  Increases critical rate by 4%. Reduce damage taken by 3%.
• Wind Storm Raijinco
• Togatsuki Paper Fan

  Increase max. CP by 10%.
• S51 Enchanted Winged Carapace

  Increases accuracy by 3%. Recover 4% HP at the start of every turn.
• S12 Golden Bujin Jitte

  Increase dodge rate by 10%.
• Ink Cloud

  Additional 40 HP damage upon all attack.
• S45 Oblivion Ward

  Increases Max. HP by 3% and Max. CP by 6%.
• Dark Blade

  Increase 2% critical rate and ignore 2% of targets dodge.
• Samurai Painted Wood

  5% chance to restrict enemy who attack user for 1 turn. (Restriction) target will not be able to use any skills.
• Seal Nightmare Wing

  Ignore 4% targets dodge.
• Sealed Wood

  A back item which lost the original effectiveness.
• S2 Scroll Capsule

  Increase attack damage by 8%. Recover 7% cp after dealing damage.
• First-Aid Kit

  100% of the purchase price will be donated to Japan earthquake relief.
• Dark Plate Twin Blades