Swordfish

A swordfish is built around speed and the long bill ahead of its eyes. Most avoid boats and swimmers, but blood, nets or confinement can turn a passing shape into a direct charge. The fish cannot wrestle or turn tightly after striking; all of its danger is concentrated into the brief line between open water and the target.

Spear Rush: piercing, melee 10 ft, +4 to hit, 2d6+2. If the swordfish moved at least 30 ft in a straight line first, the attack deals an additional 1d8 damage. A creature reduced to 0 HP by this attack remains caught on the bill until the fish turns.

Wide Turning Circle: after Spear Rush, the swordfish suffers -2 AC until the start of its next turn. Reefs, pilings, nets and water too shallow for a 30 ft approach prevent the additional damage.