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
Echuilles – Sinspawn (CR 5)
NE Huge Aberration (Evil)
Init +5; Senses Low-light vision; Perception +2
AC 18, touch 13, flat-footed 13 (-2 size, +5 Dex, +5 natural)
hp 58  (9d8+18)
Fort +5, Ref +8, Will +8
Immune Antagonized, Death, Petrify, Poison, Sleep, Zombie
Speed Swim 40 ft., Fly 20 ft.
Melee 2 Tentacles +5 (2d6+4 plus bleed)
Space 15 ft.; Reach 15 ft.
Special Attacks Blender, Drain Touch
Str 18, Dex 20, Con 14, Int 4, Wis 14, Cha 12
Base Atk +6; CMB +12; CMD 27
Feats Cleave, Improved Natural Armor, Hover, Power Attack, Weapon Focus (Tentacle)
Skills Fly +8, Swim +12
Once every 1d4 rounds as a full round action, this attack inflicts 5d6+6 points of water damage to all opponents within 30’ cone; Reflex save (DC 15) for half damage.
Drain Touch (Su)
Whenever the Echuilles damages an opponent with its normal tentacle attack; it gains HP equal to ½ the damage dealt.
A creature with this ability causes wounds that continue to bleed, inflicting additional damage each round at the start of the affected creature’s turn. This bleeding can be stopped by a successful DC 15 Heal skill check or through the application of any magical healing. The amount of damage each round is determined in the creature’s entry.