M57/BEAST

The M57/BEAST is an enemy in Xenoblade Chronicles that are members of the Mechon family. They can be found at level 55–57 in the Central Factory at the Storage Depot and on floor 1F above the Landing Strip 1 and the Landing Strip 2. after the "Maintenance Wing Escape" storyquest is completed, three of them appear in the Maintenance Wing, after being defeated, those do not respawn.

Chests rates

 * Wood = 80.4%
 * Silver = 17.6%
 * Gold = 2%

Wood

 * Materials
 * Fine Part S - 79.9%
 * Reinforced Frame - 20.1%

Silver

 * Cylinders
 * Strength Up IV - 31.3%
 * Poison Plus IV - 31.3%
 * Weapons
 * Machina Cannon - 4.6%
 * Machina Biter II - 3.9%
 * Machina Staff II - 2.6%
 * Jack Daggers - 1.4%
 * Armors
 * Sleek Trunks - 8.3%
 * Retrieved Leggings - 7%
 * F Speed Frame - 5.5%
 * M100 Arms - 4.2%

Gold

 * Weapons
 * Machina Sword II - 9.9%
 * Machina Biter II - 6.6%
 * Jack Daggers - 3.5%
 * Unique Weapons
 * Machina Blade II - 13.3%
 * Machina Nibbler II - 6.7%
 * Unique Armors
 * Agrius Helm - 33.3%
 * Agrius Plate - 16.7%
 * Advanced Books
 * Shutdown - 4.6%
 * Metal Blast - 3.1%
 * Spirit Breath - 1.6%
 * Summon Ice - 0.7%