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 :

• Merlins Magical book

  Increases attack damage 5%
• Toxic Mushroom

  Increases damage by 10% but the user takes 200 HP damage every turn.
• Deadwood Pipa
• S1 Helianthus

  Restores HP & CP by 5%. Increase purify chance by 5%.
• S42 Hanbing Hammer

  8% chance to convert damage taken to HP positively.
• Cerberus's Flame

  80% chance to burn enemy who attack user - Reduce 3% HP for 2 turns.
• Scroll: Yinyang Seal
• Skull Twins

  7% chance to convert damage taken to HP positively and 20% chance to absorb 1% HP of enemy who attack you.
• S46 Holy Drum

  Reduce damage taken by 4%. Increase chance to restrict enemy for 1 turn by 20%. Targets with “Restriction” will not be able to use any skills.
• Writing Brush
• Magical Wreath

  Recover HP by 2% and reduce 4% damage taken.
• Folk Folding Fan
• Ichimoku Gourd
• S72 Hero Twin Axe

  Increase 12% Combustion Chance and recover 3% HP at the start of every turn. (Minimum requirement of 1 Attribute Point in Fire to activate combustion effect)
• Yawata Magatama

  Increase 3% accuracy.
  Additional 20 HP damage upon all attack.
• Wooden Repeating Crossbow
• Crimson Lanterns

  Increase attack damage by 6%. Has 6% chance to convert damage taken to HP positively.
• Tail of Kyubi

  Forged with chakra of the legendary tailed beast, Kyubi. 100% immune to Burn effect and increase 3% Combustion chance.
• Sealed Wood

  A back item which lost the original effectiveness.
• Master Scroll

  Restores HP & CP by 3%.
• Orange Koi
• S2 Ancient Bone Claw

  An ancient bone that emanates great power. Increases accuracy by 8%. Recovers 100 HP every turn.
• Carrot Time Bomb

  Has 8% chance to freeze enemy who attacks user (1 turn). Frozen target cannot move but damage taken is reduced by 80%. Has 5% chance to convert damage taken to HP positively.
• Mini Scroll
• Black Double Gun

  Ignore enemys dodge rate by 3%. Increase accuracy by 3%.
• Red Ukiyo-e Kite

  4% chance to convert damage taken to HP positively and increase max. HP by 2%.
• Osuzu Shinsen

  Ninja Saga 2nd Anniversary Carnival! Increase all attack damage by 5%.