Sinspawn are presumably fiends that are formed by outlets of the multitude of pyreflies that composes Sin’s physical form. Collectively, the forms of Sinspawn coincide with those of reef-dwelling creatures, such as anemones and jellyfish. – DMLeibfrid
NE Large Aberration
Init +3; Senses Low-light vision; Perception +2
AC 13, touch 10, flat-footed 12 (-1 size, +1 Dex, +3 natural)
hp 30  (4d8+8)
Fort +3, Ref +4, Will +5
Immune Doom, Gravity, Petrify, Poison, Sleep, Zombie
Speed 30 ft., Climb 15 ft.
Space 10 ft.; Reach 10 ft.
Special Attack Gravity
Str 16, Dex 13, Con 14, Int 2, Wis 12, Cha 10
Base Atk +3; CMB +7; CMD 18
Feats Improved Ability Focus (Gravity), Toughness
Skills Fly +7, Swim +4
6/day, it weaken it’s foe with crushing gravity within a 140-ft. range. The target must make a Fortitude save (DC 16) or lose half of his current hit point total (rounded down). The save DC is wisdom-based.
Organization solitary or pair