NPCs composing that spawngroup :

An_Atra_Somnium (2%)

NPCs spawning around that spawngroup :
(Max range : 100)

griegsend1304092, range=67 (-534,2160,-55)

griegsend1304148, range=79 (-595,2293,-55)

A_Dark_Sending__1432766, range=20 (-549,2217,-50)

A_Dark_sending_1432775, range=25 (-549,2234,-52)

An_Atra_Somnium (2%)
A_Dark_Vision (2%)

A_Dark_sending_1432776, range=59 (-529,2262,-52)

A_Dark_Sending_ (2%)
A_Dark_Vision (2%)

A_Dark_Vision_1432899, range=44 (-549,2178,-52)

An_Atra_Somnium (2%)
A_Dark_Vision (2%)

A_Dark_Vision_1432900, range=26 (-549,2200,-52)

A_Dark_Vision_1432901, range=48 (-549,2262,-51)

A_Dark_Vision_1432902, range=72 (-549,2288,-52)

An_Atra_Somnium (50%)
A_Somber_Vision_ (50%)

A_Dark_Vision_1432905, range=40 (-529,2218,-51)

A_Dark_Vision_1432907, range=72 (-512,2262,-51)

A_Dark_Vision_1432909, range=83 (-498,2262,-52)