NPCs composing that spawngroup :

Invis_Man_Ambush_Trap (100%)

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

thundercrest_monocle_219, range=94 (-395,-134,302)

a_clay_sentinel (80%)
Hidetada (20%)

thundercrest_monocle_223, range=74 (-425,-175,299)

an_Isle_enlightener (100%)

thundercrest_monocle_225, range=72 (-436,-186,299)

an_Isle_enlightener (100%)

thundercrest_monocle_239, range=88 (-509,-222,302)

an_earthen_sentinel (100%)

thundercrest_monocle_247, range=96 (-578,-100,296)

an_Isle_defender (100%)

thundercrest_monocle_2_107, range=74 (-425,-175,301)

an_Isle_stormcaller (100%)

thundercrest_monocle_2_120, range=96 (-578,-100,298)

an_Isle_rejuvenator (100%)

thundercrest_monocle_4_13, range=88 (-577,-134,302)

a_clay_sentinel (100%)

thundercrest_monocle_4_114, range=74 (-425,-175,301)

an_Isle_enlightener (100%)

thundercrest_monocle_4_117, range=72 (-436,-186,301)

an_Isle_enlightener (100%)

thundercrest_monocle_5_166, range=74 (-425,-175,301)

an_Isle_defender (100%)

thundercrest_monocle_7_8, range=88 (-577,-134,302)

an_earthen_sentinel (100%)

thundercrest_monocle_7_126, range=74 (-425,-175,301)

an_Isle_defender (100%)

thundercrest_monocle_8_33, range=88 (-577,-134,302)

a_mud_sentinel (100%)

thundercrest_monocle_8_153, range=74 (-425,-175,301)

an_Isle_defender (100%)

thundercrest_monocle_8_154, range=72 (-436,-186,301)

an_Isle_defender (100%)

thundercrest_monocle_8_162, range=96 (-578,-100,298)

an_Isle_defender (100%)

thundercrest_monocle_9_1, range=74 (-425,-175,297)

Goblin_Captor (100%)

thundercrest_monocle_9_2, range=72 (-436,-186,297)

Goblin_Captor (100%)

thundercrest_monocle_9_114, range=74 (-425,-175,301)

an_Isle_stormcaller (100%)

thundercrest_monocle_12_185, range=72 (-436,-186,301)

an_Isle_enlightener (100%)

thundercrest_monocle_12_198, range=96 (-578,-100,298)

an_Isle_rejuvenator (100%)

thundercrest_287901, range=72 (-436,-186,301)