NPCs composing that spawngroup :

a_basilisk (69%)

a_fire_beetle (10%)

a_lizard_man_mystic (10%)

a_lizard_man_warrior (10%)

Petrifin (1%)

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

rathemtn_a_basilisk0, range=0 (-339,-1681,30)