"The Weird of Avoosl Wuthoqquan" by Clark Ashton Smith

Some of the names in this story... Oy vey! Including the name of the title character! I get it that you want something that sounds foreign, completely and utterly alien, but sometimes authors take it a bit too far.

fugacity: fleeting or evanescent

retiarii: a type of Roman gladiator who fought with a net and trident

oleaginous: We have two definitions here: 1) rich in, covered with, or producing oil; oily or greasy; 2) exaggeratedly and distastefully complimentary; obsequious. It seems both of these definitions could apply simultenaously to this creature.

To follow along: http://www.eldritchdark.com/writings/short-stories/243/the-weird-of-avoosl-wuthoqquan