NPCs composing that spawngroup :

TerrorSpawner (100%)

NPCs spawning around that spawngroup :
(Max range : 200)

velketor_7, range=82 (-188,150,-70)

nine (50%)
The_hair (50%)

velketor_25, range=69 (-230,155,-70)

velketor_34, range=102 (-230,122,-70)

velketor_52, range=199 (-25,243,26)

velketor_53, range=188 (-52,148,38)

a_crystal_gargoyle (100%)

velketor_76, range=138 (-138,115,-69)

#Laryk_Icepaw (20%)
an_Icepaw_kobold (80%)

velketor_77, range=86 (-212,138,-69)

an_Icepaw_champion (50%)
an_Icepaw_prophet (50%)

velketor_88, range=199 (-25,231,26)

velketor_91, range=151 (-75,253,6)

#Bledrek (20%)
a_crystal_sentinel (80%)

velketor_95, range=49 (-203,179,-15)

an_icy_watcher (100%)

velketor_103, range=48 (-211,177,-17)

TerrorSpawner (100%)

velketor_106, range=50 (-174,216,-13)

TerrorSpawner (100%)

seven_189761, range=155 (-244,70,-70)

From_no_where (50%)
seven (50%)

TerrorSpawner_189772, range=113 (-220,111,-12)

TerrorSpawner (100%)

TerrorSpawner_189773, range=91 (-167,152,-15)

TerrorSpawner (100%)

velketor_282453, range=81 (-187,151,-71)

an_Icepaw_champion (100%)