NPCs composing that spawngroup :

#The_Insanity_Crawler_ (25%)

Shadows (25%)

The_stones (25%)

You_can_feel (25%)

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

akheva1432087, range=74 (1060,-1540,13)

akheva1432086, range=68 (1060,-1650,17)

Centi_Thall (34%)
Xin_Thall (33%)
Xin_Thall (33%)

akheva1432085, range=99 (1100,-1650,17)

Centi_Thall (50%)
Xin_Xakra (50%)

The_stones_1433660, range=25 (1000,-1619,19)

The_stones_1433661, range=15 (1000,-1599,19)

Shadows (34%)
The_stones (33%)
You_can_feel (33%)

The_stones_1433662, range=20 (1015,-1619,19)

The_stones_1433667, range=25 (1030,-1619,19)

The_stones_1433668, range=15 (1030,-1599,19)

The_stones_1433669, range=36 (1045,-1619,19)

The_stones_1433670, range=30 (1045,-1599,19)

The_stones_1433672, range=49 (1060,-1619,19)

The_stones_1433673, range=45 (1060,-1599,19)

The_stones_1433674, range=63 (1075,-1619,19)

The_stones_1433675, range=60 (1075,-1599,19)

The_stones_1433676, range=75 (1090,-1599,19)

The_stones_1433680, range=92 (1105,-1619,19)

The_stones_1433681, range=90 (1105,-1599,19)

SheiTrap, range=13 (1012,-1612,17)

The_Insanity_Crawler (100%)