Porpoises measure 4–6 feet long and weigh 110 to 170 pounds. The following stats may also be used to describe whales of similar size.
Porpoises have the following traits:
Aquatic: Porpoises can move in water without making Swim checks and cannot drown in water.
Blindsight (Ex): Porpoises can “see” by emitting high-frequency sounds, inaudible to most other creatures. This form of echolocation allows them to locate objects and creatures within 120 feet. A silence spell negates this and forces the porpoise to rely on its vision, which is approximately as good as a human’s.
Skill Bonuses: Porpoises gain a +4 species bonus on Listen and Spot checks. These bonuses are lost if blindsight is negated.
Bonus Feat: Porpoises gain the bonus feat Weapon Finesse (slam).
Porpoise: CR 1/2; Medium animal; HD 2d8+2; hp 11; Mas 13; Init +3; Spd swim 80 ft.; Defense 15, touch 13, flatfooted 12 (+3 Dex, +2 natural); BAB +1; Grap +1; Atk +4 melee (1d4, slam); Full Atk +4 melee (1d4, slam); FS 5 ft. by 5 ft.; Reach 5 ft.; SQ aquatic, blindsight; AL none or school; SV Fort +4, Ref +6, Will +1; AP 0; Rep +0; Str 11, Dex 17, Con 13, Int 5, Wis 12, Cha 6.
Skills: Listen +10 (+6 if blindsight is negated), Spot +10 (+6 if blindsight is negated).
Feats: Weapon Finesse (slam).
Advancement: 3–4 HD (Medium); 5–6 HD (Large).