NPCs composing that spawngroup :

imp_defender (100%)

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

soldungc2780061, range=62 (424,-277,-9)

a_pool_of_living_lava (100%)

soldungc2780062, range=152 (319,-247,10)

a_burning_mire (100%)

soldungc2780063, range=166 (401,-176,4)

a_pool_of_living_lava (100%)

soldungc2780078, range=181 (596,-241,4)

imp_defender (100%)

soldungc2780169, range=83 (399,-409,18)

imp_defender (100%)

soldungc2780170, range=133 (385,-458,18)

imp_guardian (100%)

soldungc2780171, range=130 (419,-465,18)

a_fireborn_wanderer (80%)
Kushara_Perecran (20%)

soldungc2780172, range=77 (473,-408,4)

imp_vanquisher (100%)

soldungc2780173, range=108 (438,-445,18)

imp_vanquisher (100%)

soldungc2780186, range=166 (323,-453,1)

soldungc2780187, range=133 (325,-402,15)

a_blistering_horror (50%)
a_brain_scorched_goblin (50%)

soldungc2780190, range=57 (391,-364,31)

a_fireborn_master (100%)

soldungc2780191, range=50 (439,-387,31)

soldungc2780192, range=69 (373,-339,16)

imp_defender (50%)
imp_guardian (50%)

soldungc2780193, range=58 (414,-388,31)

imp_vanquisher (100%)

soldungc2780194, range=29 (453,-364,16)

imp_guardian (50%)
imp_guardian (50%)

soldungc2780195, range=147 (299,-373,15)

a_blistering_horror (100%)

soldungc2780196, range=109 (543,-380,16)

imp_guardian (50%)
imp_vanquisher (50%)

soldungc2780197, range=100 (542,-342,12)

#Pulsating_Pool_of_Magma (50%)
a_burning_mire (50%)

soldungc2780198, range=152 (588,-381,14)

a_blistering_horror (50%)
a_smoldering_abomination (50%)

soldungc2780202, range=88 (363,-377,250)

a_fireborn_outcast (100%)

soldungc2780203, range=169 (611,-329,11)

a_conflagarant_terror (100%)

soldungc2780216, range=52 (484,-368,17)

soldungc2780219, range=188 (294,-453,-3)

a_pool_of_living_lava (100%)

soldungc2780221, range=158 (598,-310,2)