Lusca

The lusca gains 2 extra reactions at the start of each of its turns that it can use only to make an Attack of Opportunity with its jaws. It can't use more than one Attack of Opportunity triggered by the same action.

Trigger A creature within the monster's reach uses a manipulate action or a move action, makes a ranged attack, or leaves a square during a move action it's using.

Effect The monster attempts a melee Strike against the triggering creature. If the attack is a critical hit and

The lusca can smell blood in the water up to 1 mile away.

When the lusca is near the surface for more than 1 hour, clouds appear and deliver a thunderstorm with a 2-mile radius centered on its location. The weather returns to normal 1 hour after the lusca departs.

The lusca tries to capsize an adjacent aquatic vessel of its size or smaller. It must succeed at an Athletics check with a DC of 35 (reduced by 5 for each size smaller the vessel is than the lusca) or the pilot's Sailing Lore DC, whichever is higher.

Saving Throw DC 38 fortitude

Maximum Duration 6 rounds

Stage 1 4d6 poison damage and clumsy 1 (1 round)

Stage 2 6d6 poison damage and clumsy 2 (1 round)

The lusca makes three jaws Strikes, each against a different target. These attacks count toward the lusca's multiple attack penalty, but the penalty doesn't increase until after the lusca makes all of these attacks. If the lusca subsequently uses the Grab action, it Grabs any number of creatures it hit with Ravenous Jaws.

Jaws

Huge, (4d12+9)[bludgeoning], Rupture 38