NPCs composing that spawngroup :

a_clay_sentinel (100%)

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

thundercrest_monocle_340, range=97 (-822,-189,112)

a_Dirtdigger_bonecracker (100%)

thundercrest_monocle_2_130, range=97 (-822,-189,111)

a_Dirtdigger_adept (100%)

thundercrest_monocle_4_137, range=69 (-772,-342,119)

a_clay_sentinel (100%)

thundercrest_monocle_5_38, range=20 (-771,-293,119)

an_earthen_sentinel (100%)

thundercrest_monocle_5_187, range=97 (-822,-189,111)

a_Dirtdigger_mender (100%)

thundercrest_monocle_7_3, range=7 (-770,-280,119)

a_clay_sentinel (100%)

thundercrest_monocle_7_106, range=97 (-822,-189,111)

a_Dirtdigger_bonecracker (100%)

thundercrest_monocle_8_35, range=5 (-770,-267,119)

a_clay_sentinel (100%)

thundercrest_monocle_8_172, range=97 (-822,-189,111)

a_Dirtdigger_spiritist (100%)

thundercrest_monocle_12_54, range=58 (-772,-331,119)

a_mud_sentinel (100%)

thundercrest_287871, range=97 (-822,-189,111)