Brontosaurus | Monster Guide for D&D 5th Edition

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This massive four-legged dinosaur is large enough that most predators leave it alone. Its deadly tail can drive away or kill smaller threats.

Gargantuan Beast (Dinosaur), Unaligned

Proficiency Bonus: +3
Armor Class: 15 (natural armor)
Hit Points: 121 (9d20 + 27)
Speed: 30 ft.

    STR – 21 (+5)
    DEX – 9 (-1)
    CON – 17 (+3)
    INT – 2 (-4)
    WIS – 10 (+0)
    CHA – 7 (-2)

Saving Throws: Con +6

Senses: passive Perception 10

Languages: Challenge 5 (1,800 XP)

ACTIONS

Stomp. Melee Weapon Attack: +8 to hit, reach 20 ft., one target. Hit: 27 (5d8 + 5) bludgeoning damage, and the target must succeed on a DC 14 Strength saving throw or be knocked prone.

Tail. Melee Weapon Attack: +8 to hit, reach 20 ft., one target. Hit: 32 (6d8 + 5) bludgeoning damage.