Grinder's Cloak

Grinder's Cloak
Information
Type	Hunter Cloak
Level	20
Item Level	40
Rarity	Rare
Acquired by	??
Cost	?
Description	"First, check your cloak for damage. Second, inspect yourself for major wounds." - Handbook of (Un)Controversial Advice

Grinder's Cloak is a level 20 Rare Hunter Cloak. Grinder's Cloak can be obtained by ???