What is the fine-grained topic of the following text: Xavius, Nightmare Lord of Satyrs, an instrument of the Legion turned by Sargeras, yet conceited and evil enough to still be secretly serving his Old God master N’Zoth and working towards freeing him (from wherever the hell he’s entombed), is pretty much running amok. Only return the topic.
The character Xavius from the World of Warcraft universe and his allegiances.