Amakna Castle Rat Dungeon Key

 is a key.

Obtaining

 * Crafted by a Handyman (Lv. 40) from
 * 10 Grossewer Shaman Skin
 * 10 Grossewer Rat Hair
 * 10 Grossewer Shaman Skin
 * 1 First Key to Sphincter's Dungeon
 * 1 Second Sphincter Dungeon Key