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 :

• Mech of Battle Gear

  Increase critical chance 3% and critical damage 8%.
• Choco Tama

  Increase accuracy by 5% and increase healing power of scrolls by 25%.
• Grand Light Gourd

  Increase 3% damage
• S56 Curse Brush

  A legendary Ink Brush that has the ability to materialize drawings. Increase critical rate by 5% and accuracy by 6%.
• S16 King Kong Ring

  Recover HP by 1% and reduces damage received by 4%.
• Spartan Shield

  Restore 100 HP every turn. Reduce damage taken by 5%.
• S54 Ebony Nunchaku

  Increases damage by 7%. Has 20% chance to apply Restriction on enemies who attacks the user for 1 turn.
• Mousetrap

  15% chance to restrict enemy who attack user for 1 turn. Restriction target will not be able to use any skills.
• Shoguns Badge Gourd

  Increase Max. HP & CP by 3%
• 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.
• Flame Blade Raijinco
• GM back item
• S66 Dark Wings

  Remnants of a powerful dark spirit. Increases attack and critical rate by 4%. Increases accuracy by 5%.
• Shigu Twin Blades
• Pirate Skull Flag

  Increase 6% purify chance. Reduce damage taken by 5%.
• Giant Copper Coins

  Increase Mission gold reward by 30%.(Mission Only)
• S9 Ancient Akazonke Gunbai

  Increase critical rate and accuracy by 4%. But reduce Max.HP by 2%.
• Wind Storm Raijinco
• Fairy Wings

  Fairy wings that owned by a fairy
• Ultimate Taiko

  Recover 120 HP at the start of every turn. Has 15% chance to restrict enemy who attack user for 1 turn. Restriction target will not be able to use any skills.
• Christmas Deer

  Increase critical chance 2% and critical damage 6%.
• Scroll: Terminated Rock
• Native Drum

  5% chance to convert damage taken to HP positively.
• S49 Serpent Dragon Chakram

  An exceptional weapon crafted with serpent and dragon remains. Increases agility by 1 and accuracy by 7%.
• Dragon Crucifix Spear
• Ninja Postman Bag

  Increase healing power of scrolls by 50%.
• Virgos Eternal Wings

  Increases agility by 1. Increases users attack damage by 3%.