Amorous Arca

Amorous Arca is a Mechon that is a Unique Monster in Xenoblade Chronicles. It can be found at level 57 near the third floor Bulkhead Controls in the Mechonis Field. It is flanked by two M66/TRICKs and two Defensive/ONIONs that will defend it.

Chests rates

 * Wood = 0%
 * Silver = 0%
 * Gold = 100%

Wood

 * Materials
 * Reinforced Plate - 85%
 * Spathi Glyph - 15%

Silver

 * Cylinders
 * Confuse Resist IV - 25%
 * Initial Tension IV - 25%
 * Weapons
 * Machina Sniper - 6.9%
 * Machina Rod - 4.6%
 * Machina Cannon - 2.7%
 * Karma Blades - 2.5%
 * Armors
 * Gemini Gear - 10.8%
 * Sleek Glasses - 10.6%
 * F Attack Frame - 6.6%
 * Alcyone Top - 5.3%

Gold

 * Weapons
 * Machina Blade - 6%
 * Machina Driver - 5.7%
 * Machina Nibbler - 5%
 * Machina Rod - 3.4%
 * Unique Weapons
 * Machina Rifle II - 13.3%
 * Machina Nibbler II - 6.7%
 * Unique Armors
 * Agni Plate - 20.9%
 * Lord Leggings - 17.4%
 * Agrius Arms - 11.7%
 * Advanced Art Books
 * Heat Bullet - 4.6%
 * Guard Shift - 3.1%
 * Rage - 1.6%
 * Burst End - 0.7%