Brine Shark (BB)Creature 3
Source Pathfinder Beginner Box
Perception +8 (darkvision)
Languages none
Skills Athletics +10, Stealth +11, Survival +8
Str +3, Dex +2, Con +2, Int -4, Wis +1, Cha +0
AC 19; Fort +9; Reflex +11; Will +6;
HP 45
Speed 15 feet (swim 50 feet)
Immunities bleed, poison, sleep
Resistances Fire 5
Jaws
+11 (+6, +1) to hit (unarmed) 1d12+7 PiercingDeep Plunge

The brine shark dives straight down into the water, swimming up to 100 feet in a straight vertical line. It can use this ability while Grabbing a creature.
Grab
When the brine shark succeeds at its jaws Strike, it can use this action immediately after to attempt to Grapple the target. This Grapple doesn't apply or count toward the shark's multiple attack penalty.
Water elementals roam the endless oceans of the Plane of Water. They can be brought to the world with summoning magic or through natural disasters like floods or hurricanes. Though water elementals can be very destructive, they aren't always malicious. Just as water can bring life to those in need, its waves can pound shores and its rains flood cities. Water elementals are similarly difficult to predict.
Brine sharks take forms resembling sharks made entirely of water and are fierce, but among the weaker water elementals. They often slip into mortal oceans, competing with natural predators or even joining schools of flesh and blood sharks.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
AquaticAquatic creatures are at home underwater. Their bludgeoning and slashing unarmed Strikes don't take the usual –2 penalty for being underwater. Aquatic creatures can breathe water but not air.
ElementalCreatures directly tied to an element and native to the elemental planes. Elementals don't need to breathe.
WaterEffects with the water trait either manipulate or conjure water. Those that manipulate water have no effect in an area without water. Creatures with this trait consist primarily of water or have a connection to magical water.