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This eel-like creature sports sharp frills that run along the back of humanoid torso and down its long, powerful tail.

Siyokoy CR 10

XP 9,600
N Medium aberration (aquatic)
Init +5; Senses blindsight 60 ft., darkvision 60 ft., scent; Perception +22


AC 26, touch 16, flat-footed 20 (+5 Dex, +1 dodge, +10 natural)
hp 136 (13d8+78)
Fort +10, Ref +9, Will +10
DR 10/slashing; Immune cold, electricity, poison
Weaknesses light sensitivity


Speed 30 ft., swim 60 ft.
Melee bite +18 (1d6+9/19-20 plus grab), 2 claws +18 (1d6+9), tail slap +14 (1d6+4 plus stunning shock)
Space 5 ft.; Reach 5 ft. (10 ft. with tail slap)
Special Attacks constrict (2d6+4), stunning shock, swim-by attack


Str 28, Dex 21, Con 22, Int 12, Wis 15, Cha 11
Base Atk +9; CMB +18 (+24 grapple); CMD 34
Feats Alertness, Dodge, Improved Critical (bite), Improved Grapple, Power Attack, Stealthy, Weapon Focus (tail slap)
Skills Disable Device +16, Escape Artist +7, Intimidate +9, Knowledge (geography) +10, Perception +22, Sense Motive +4, Stealth +25, Survival +16, Swim +25
Languages Aquan


Stunning Shock (Su)

A siyokoy can emit a strong electrical charge from its tail. When it hits a creature with its tail slap, the attack deals 3d6 points of electrical damage and the target must succeed at a DC 22 Fortitude save or be stunned for 1d4 rounds.

Swim-By Attack (Ex)

Extremely quick in the water, a siyokoy gains Spring Attack as a bonus feat when swimming.