NPCs composing that spawngroup :

#a_virulent_mosquito (5%)

a_lifestealer_mosquito (45%)

a_lifestealer_mosquito (50%)

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

cazicthule pool_of_slime and swirling ooze, range=24 (907,183,-76)

a_pool_of_slime (40%)
a_swirling_ooze (60%)

cazicthule_a_lifestealer_mosquito136, range=46 (931,195,-67)

a_lifestealer_mosquito (60%)
a_lifestealer_mosquito (40%)

cazicthule ooze and swirling ooze, range=57 (843,160,-68)

an_ooze (60%)
a_swirling_ooze (40%)

cazicthule #a_swirling_green_mass, range=54 (946,189,-80)