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 :

• S11 Wood Spirit's Shield

  Increase max. HP by 9% and 20% chance to absorb 3% HP of enemy who attack you.
• S9 Akazonke Gunbai

  Increase 4% critical rate and ignore 4% targets dodge.
• Water Energy Skis
• Black Metal Hammer
• Heian-kyo Shamisen
• Scroll: Flying Phoenix
• Spartan Shield

  Restore 100 HP every turn. Reduce damage taken by 5%.
• Folding Fan: Shino
• Shield of Holy Beast

  Reduce 5% damage taken. 6% chance to convert damage taken to HP positively.
• Extra Large Presents Bag

  A large present bag, but nobody knows what it contains.
• Raccoon Tail
• Screw Pattern Skis
• S43 Extreme Lotus

  The back item contains 30% chance to absorb 3% HP of enemy which makes attack on you.
• Ink Cloud

  Additional 40 HP damage upon all attack.
• Thanksgiving Balloons

  Increase max. HP by 2%.
• Christmas Treasure Bag

  Increase agility by 1.
• Venom Ghost

  Has 5% chance to convert damage taken to HP positively. Recover HP by 100 every turn.
• Pirate Skull Flag

  Increase 6% purify chance. Reduce damage taken by 5%.
• Osuzu Shinsen

  Ninja Saga 2nd Anniversary Carnival! Increase all attack damage by 5%.
• Tail of Capricorn

  Increases dodge rate by 4%. Recovers 3% HP with every charge.
• Super Rabbit Doll

  Increase damage by 9%.
• Dark World Hammer
• Enternal Love Scroll

  Increase 5% Combustion chance and reduce 1% damage taken.
• Balloon Rabbit Doll

  Has 8% chance to convert damage taken to HP positively.
• S12 Ancient Blood Evil Gourd

  Increase max. HP by 5%. But reduce Max.CP by 1%.
• Scroll: Red Curse seal
• S45 Oblivion Ward

  Increases Max. HP by 3% and Max. CP by 6%.