Huge Monstrosity, unaligned
Armor Class 16 (natural armor)
Hit Points 168 (16d12+64)
Speed walk +40
Challenge 11
Saving Throws con +8, dex +3, wis +5
Skills perception +1
Damage Resistances thunder
Condition Immunities deafened
Senses passive Perception 15
Languages —
Siege Monster. Double damage to objects/structures.
Multiattack. Three Slam attacks.
Slam. Melee Weapon Attack: +11 to hit, 10 ft., one target, 23 (3d10+7) bludgeoning damage and the target must make DC 16 Str save or be knocked prone.
Thunderous Bellow (Recharge 5-6). The thundercall hadrosaur unleashes a ground-shattering bellow in a 120' cone. All in area make a DC 16 Con save. On a failure a creature takes 38 (7d10) thunder and is knocked prone. On a success a creature takes half the damage and isn't knocked prone.
Sonic Shield. The hadrosaur adds 4 to its AC vs. one ranged attack that would hit it. To do so the hadrosaur must see the attacker and not be in an area of magical silence.
Source: Tome of Beasts 3 · OGL/Open