NPCs composing that spawngroup :

a_prismatic_wyvern (100%)

NPCs spawning around that spawngroup :
(Max range : 200)

crystallos91766, range=196 (1107,520,3)

crystallos91770, range=166 (1104,565,20)

crystallos91775, range=178 (1054,676,16)

crystallos91778, range=130 (1155,566,20)

crystallos91780, range=178 (1056,703,20)

crystallos91783, range=101 (1130,674,19)

crystallos91789, range=180 (1090,782,20)

crystallos91792, range=86 (1191,747,20)

crystallos91803, range=164 (1239,835,195)