Spinosaurus

The largest predator ever to walk, a sail-backed river-hunter longer than the tyrant lizard, equally lethal on land and in deep water. It fishes with hooked claws and a crocodilian snout, then drags larger prey under. It patrols deltas and flooded forest, claiming whole watersheds as its own, and it will float for hours like drifting timber before surging up beneath whatever has come to the water to drink.

Hooked Claws: slashing, melee 10 ft, +4 to hit, 3d8+6 slashing. Snapping Bite: piercing, melee 10 ft, 2d10+6 piercing; a held target is dragged underwater to drown on a failed Dex Quick save, cooldown 2 rounds.

Amphibious: breathes air and water and swims at speed, ambushing from rivers like a floating log. Titan Bulk: too massive to be held or knocked prone. Senses: Night Vision (120 ft), Vibration Sense (feels movement, water vibration, 90 ft).