Armor Class 15 (natural armor)
Hit Points 232 (15d20 + 75)
Speed 40 ft.
Saving Throws —
Skills Perception +5
Damage Immunities False
Condition Immunities False
Senses passive Perception 15
Languages —
Challenge 13 (10,000 XP)
Hold Breath. The spinosaurus can hold its breath for 1 hour.
Reptilian Affinity. The spinosaurus never willingly attacks a reptilian Humanoid, such as a lizardfolk or dragonborn, unless attacked first. If magically forced to attack such a creature, the spinosaurus has disadvantage on attack rolls against it. This trait doesn't function if the spinosaurus's rider or tamer directs it to attack.
Siege Monster. The spinosaurus deals double damage to objects and structures.
Multiattack. The spinosaurus makes one Bite attack and two Claw attacks.
Bite. Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 33 (4d12 + 7) piercing damage. If the target is a Large or smaller creature, it is grappled (escape DC 18). Until this grapple ends, the target is restrained, and the spinosaurus can't Bite another target.
Claw. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 21 (4d6 + 7) slashing damage.
Tail. Melee Weapon Attack: +12 to hit, reach 20 ft., one target. Hit: 16 (2d8 + 7) bludgeoning damage.
Frightful Presence. Each creature of the spinosaurus' choice that is within 120 feet of the spinosaurus and aware of it must succeed on a DC 18 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the spinosaurus's Frightful Presence for the next 24 hours.
The spinosaurus can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The spinosaurus regains spent legendary actions at the start of its turn.
Move. The spinosaurus moves up to half its speed without provoking opportunity attacks.
Roar. The spinosaurus uses Frightful Presence.
Tail Attack (Costs 2 Actions). The spinosaurus makes one Tail attack.