NPCs composing that spawngroup :

imp_defender (50%)

imp_guardian (50%)

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

soldungc2780055, range=158 (218,-373,15)

a_conflagarant_terror (100%)

soldungc2780056, range=193 (183,-376,15)

a_blistering_horror (100%)

soldungc2780061, range=80 (424,-277,-9)

a_pool_of_living_lava (100%)

soldungc2780062, range=106 (319,-247,10)

a_burning_mire (100%)

soldungc2780063, range=165 (401,-176,4)

a_pool_of_living_lava (100%)

soldungc2780169, range=74 (399,-409,18)

imp_defender (100%)

soldungc2780170, range=119 (385,-458,18)

imp_guardian (100%)

soldungc2780171, range=134 (419,-465,18)

a_fireborn_wanderer (80%)
Kushara_Perecran (20%)

soldungc2780172, range=121 (473,-408,4)

imp_vanquisher (100%)

soldungc2780173, range=124 (438,-445,18)

imp_vanquisher (100%)

soldungc2780186, range=124 (323,-453,1)

soldungc2780187, range=79 (325,-402,15)

a_blistering_horror (50%)
a_brain_scorched_goblin (50%)

soldungc2780188, range=194 (269,-503,4)

a_Vrodak_bloodclaw (50%)
a_Vrodak_firewalker (50%)

soldungc2780189, range=173 (306,-499,6)

a_Vrodak_bloodclaw (50%)
a_Vrodak_bloodclaw (50%)

soldungc2780190, range=30 (391,-364,31)

a_fireborn_master (100%)

soldungc2780191, range=81 (439,-387,31)

soldungc2780193, range=63 (414,-388,31)

imp_vanquisher (100%)

soldungc2780194, range=83 (453,-364,16)

imp_guardian (50%)
imp_guardian (50%)

soldungc2780195, range=81 (299,-373,15)

a_blistering_horror (100%)

soldungc2780196, range=174 (543,-380,16)

imp_guardian (50%)
imp_vanquisher (50%)

soldungc2780197, range=169 (542,-342,12)

#Pulsating_Pool_of_Magma (50%)
a_burning_mire (50%)

soldungc2780202, range=39 (363,-377,250)

a_fireborn_outcast (100%)

soldungc2780216, range=114 (484,-368,17)

soldungc2780219, range=138 (294,-453,-3)

a_pool_of_living_lava (100%)

soldungc2780223, range=138 (245,-392,11)

a_fireborn_outcast (100%)

soldungc2780224, range=69 (442,-337,31)

imp_defender (100%)