NPCs composing that spawngroup :

Iron_Sentinel (100%)

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

overthere_100, range=98 (2802,2056,-50)

overthere_101, range=121 (2685,2130,-50)

overthere_138, range=181 (2767,2332,-50)

overthere_139, range=184 (2791,2338,-50)

overthere_151, range=162 (2642,2168,-52)

overthere_152, range=176 (2628,2157,-52)

overthere_177, range=166 (2638,2157,-52)

overthere_181, range=169 (2962,2214,-48)

overthere_185, range=101 (2889,2210,-47)

The_sounds_189473, range=64 (2867,2166,-25)