unique n large animal 

Perception +16; low-light vision

Skills Athletics +18, Stealth +16 (+20 in water)

Str +6 Dex +2 Con +4 Int -5 Wis +3 Cha -2

AC  26; Fort +18, Ref +16, Will +15

HP 140

Speed 20 feet, swim 25 feet

Melee [>] jaws +20, Damage 2d10+8 piercing plus Grab

Melee [>] tail +20 (agile, reach 10 feet), Damage 2d6+8 bludgeoning

Death Roll [>] (attack) Requirements Old Taedriathad must have a creature grabbed; Effect Old Taedriathad tucks its legs and rolls rapidly, twisting its victim. It makes a jaws Strike with a +2 circumstance bonus to the attack roll against the grabbed creature. If it hits, it also knocks the creature prone. If it fails, it releases the creature.

Deep Breath Old Taedriathad can hold its breath for about 4 hours.

Into the Deep [>] Requirements Old Taedriathad must have a creature grabbed; Effect Old Taedriathad Swims, bringing its victim along with it.

Thunderous Tail [>>] Old Taedriathad makes up to three tail Strikes against different targets. Any target hit must succeed at a DC 25 Fortitude save (DC 30 on a critical hit) or be knocked prone.

Strength of Thousands #2: Spoken on the Song Wind, page 40.