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=59 (1060,-1540,13)

akheva1432086, range=51 (1060,-1650,17)

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

akheva1432085, range=64 (1100,-1650,17)

Centi_Thall (50%)
Xin_Xakra (50%)

The_stones_1433660, range=63 (1000,-1619,19)

The_stones_1433661, range=60 (1000,-1599,19)

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

The_stones_1433662, range=49 (1015,-1619,19)

The_stones_1433663, range=45 (1015,-1599,19)

The_stones_1433667, range=36 (1030,-1619,19)

The_stones_1433668, range=30 (1030,-1599,19)

The_stones_1433669, range=25 (1045,-1619,19)

The_stones_1433670, range=15 (1045,-1599,19)

The_stones_1433672, range=20 (1060,-1619,19)

The_stones_1433674, range=25 (1075,-1619,19)

The_stones_1433675, range=15 (1075,-1599,19)

The_stones_1433676, range=30 (1090,-1599,19)

The_stones_1433680, range=49 (1105,-1619,19)

The_stones_1433681, range=45 (1105,-1599,19)

The_stones_1433682, range=63 (1120,-1619,19)

The_stones_1433683, range=60 (1120,-1599,19)

The_stones_1433684, range=77 (1135,-1619,19)

The_stones_1433685, range=75 (1135,-1599,19)

The_stones_1433688, range=90 (1150,-1599,19)

SheiTrap, range=77 (1085,-1672,18)