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Hippocampus

Source Inner Sea Combat pg. 14
Companion Type Monstrous
Monster Entry Link
This creature has the foreparts of a horse and the hindquarters of a fish. Its forelegs end in splayed fins rather than hooves.
Starting Statistics: Size Large; Speed 5 ft., swim 40 ft.; AC +4 natural armor; Attack bite (1d4); Ability Scores Str 16, Dex 9, Con 15, Int 2, Wis 12, Cha 11; Special Qualities darkvision 60 ft., low-light vision, scent, water dependency.

4th-Level Advancement: Speed Swim 60 ft.; Attack bite (1d6); Ability Scores Str +2, Dex +4.

Mastery (7th Level) The hippocampus's swim speed increases by 20 feet, and it gains a tail slap secondary attack that deals 1d4 points of damage plus half its Strength bonus.