NPCs composing that spawngroup :

A_Dark_Vision (2%)

A_Dark_Vision_ (2%)

A_Writhing_Vision (2%)

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

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

griegsend1304221, range=66 (-507,2313,-55)

a_wretched_servant (50%)
servant_of_the_magistrate (50%)

A_Dark_Sending__1432766, range=45 (-549,2217,-50)

A_Dark_sending_1432775, range=28 (-549,2234,-52)

An_Atra_Somnium (2%)
A_Dark_Vision (2%)

A_Dark_sending_1432776, range=20 (-529,2262,-52)

A_Dark_Sending_ (2%)
A_Dark_Vision (2%)

A_Dark_Vision_1432895, range=84 (-587,2338,-51)

Alchemist (2%)

A_Dark_Vision_1432896, range=48 (-569,2218,-51)

An_Atra_Somnium (2%)

A_Dark_Vision_1432899, range=84 (-549,2178,-52)

An_Atra_Somnium (2%)
A_Dark_Vision (2%)

A_Dark_Vision_1432900, range=62 (-549,2200,-52)

A_Dark_Vision_1432902, range=26 (-549,2288,-52)

An_Atra_Somnium (50%)
A_Somber_Vision_ (50%)

A_Dark_Vision_1432903, range=65 (-549,2327,-52)

A_Dark_Vision (2%)

A_Dark_Vision_1432905, range=48 (-529,2218,-51)

A_Dark_Vision_1432907, range=37 (-512,2262,-51)

A_Dark_Vision_1432909, range=51 (-498,2262,-52)