Coral Encrustation: Part of the creature's body is encased in coral. This provides a +4 bonus to Armor Class. Reduce the creature's Dexterity by 1d4.
Spit Sand: 3/day, the creature can spew wet globs of sand at an opponent within 15 feet. On a failed Reflex save, the opponent is blinded for 1d4 rounds.
Gummy Secretions: The creature can exude a sticky secretion from its body. It has a +4 bonus on Climb and grapple checks. Most of the creature's treasure can be found stuck to its body as a form of decoration.
Blindsense: The creature can sense the electrical impulses of other living things, giving it blindsense 60 feet.
Tusks: A pair of walrus-like tusks grow from the creature's mouth (if it has one), giving it a bite attack (1d4 for a Small creature, 1d6 for a Medium creature, and 1d8 for a Large creature).
Cartilagenous Skeleton: The creature's skeleton (if it has one) becomes soft and pliable. It gains a +8 bonus on Escape Artist checks and DR 5/slashing and piercing.
Flipper Feet: The creature's feet become flippers. It gains as Swim speed (40 ft.), but its ground speed is reduced by half.