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 :

• Great Wooden Hammer

  Increase healing power of scrolls by 50%.
  Reduce 8 HP damage taken.
• Vampire Cloak

  Increase healing power of scrolls by 100.
• Bell of Beast

  Recover HP by 3%. 15% chance to absorb 3% HP of enemy who attack you.
• Nightmare Grudge

  Ignore 4% targets dodge.
• Cerberus's Flame

  80% chance to burn enemy who attack user - Reduce 3% HP for 2 turns.
• Umiyuki Painted Wood

  Reduce 24 HP damage taken.
• Shinobi Curse Battle Umbrella
• Large Wooden Hammer
• Scarlet Sword Wheel

  Increases damage by 5% and dodge rate by 3%.
• S10 Kikyo Umbrella

  6% chance to convert damage taken to HP positively.
• White Metal Hammer
• Ninja Postman Bag

  Increase healing power of scrolls by 50%.
• Aboriginal Hunting Set

  Increase accuracy by 5% and Combustion chance 6%.
• Screw Pattern Skis
• Smart Phone
• Fathers Treasure

  2014 Fathers Day special back item. Doubles the TP reward from TP missions.
• Skull Twins

  7% chance to convert damage taken to HP positively and 20% chance to absorb 1% HP of enemy who attack you.
• Training Dummy

  Increases accuracy by 5% and dodge rate by 4%.
• Sand Gourd
• Red Ukiyo-e Kite

  4% chance to convert damage taken to HP positively and increase max. HP by 2%.
• Hide Guitar
• Sagittarius Hunting Set

  Increases dodge rate by 4%. Additional 80 HP damage on all attacks.
• Folk Folding Fan
• Scroll: Tenku
• Jingle Bell

  Reduce 2% damage taken. Recover 3% HP at the start of every turn.
• S12 Ancient Blood Evil Gourd

  Increase max. HP by 5%. But reduce Max.CP by 1%.
• S20 Empire Battle Gear

  6% chance to convert damage taken to HP positively.