Spawns on 2nd map of Garlaige Citadel past the Banishing Gate #1 at H-7 and H-9 found it easy to farm Blue mage spell Stinking Gas }2-3 hours ,the Fetid Flesh has not used it even once,so i would not recommend it as an easy mob to learn Stinking Gas.I have seen around 50 various abilities,but not one Stinking Gas.