NPCs composing that spawngroup :

Deathbone_Archmagus (50%)

Elite_Corrupted_Knight (50%)

Elite_Death_Knight (50%)

Firebone_Archmagus (50%)

Firebone_Magus (50%)

Pestilence_Archon (50%)

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

codecay2000021, range=65 (-113,384,-54)

#_Carprin_Deatharn (50%)

codecay2000044, range=64 (-106,269,-59)

codecay2000045, range=92 (-3,275,-59)

codecay2000056, range=49 (-32,344,-59)

codecay2000057, range=57 (-78,385,-59)

codecay2000058, range=88 (-147,385,-59)

codecay2000059, range=80 (-155,353,-59)

codecay2000060, range=66 (-143,309,-59)

codecay2000125, range=84 (-42,252,-59)

codecay2000144, range=58 (-66,271,-59)

codecay_275202, range=53 (-28,314,-261)