this guy spawns 3 pets at the same time:
Dagour's Wyvern (drg pet)
Dagour's Hound (bst pet)
Dagour's Elemental (smn pet, its fenrir, will do Howling Moon for Astral Flow)
he also pops 2 Hydra Bst, Smn, and Drg, so you will have as many as 16 things (1 NM shadow, 6 shadows, 9 pets) to deal with on this pull.