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Dinosaur, Diplodocus

Gargantuan beast, unaligned

Armor Class 16 (natural armor)
Hit Points 198 (12d20 + 72)
Speed 30 ft.

21 (+5) 10 (+0) 23 (+6) 2 (-4) 14 (+2) 5 (-3)

Skills Athletics +9
Damage Resistances bludgeoning
Senses passive Perception 12
Challenge 10 (5,900 XP)

Special Traits

  • Trampling Charge. If the diplodocus moves at least 20 feet straight toward a creature and then hits it with a tail attack on the same turn, that target must succeed on a DC 17 Strength saving throw or be knocked prone. If the target is prone, the diplodocus can make one stomp attack against it as a bonus action.
  • Unstoppable. The diplodocus has advantage on ability checks and saving throws against effects that would restrain it or knock it prone.


  • Multiattack. The diplodocus makes two Tail Whip attacks.
  • Tail Whip. Melee Weapon Attack: +9 to hit, reach 20 ft., one target. Hit: 18 (3d8 + 5) slashing damage. If the target is a Large or smaller creature, it must succeed on a DC 17 Strength check or be knocked prone.
  • Stomp. Melee Weapon Attack: +9 to hit, reach 5 ft., one prone creature. Hit: 21 (3d10 + 5) bludgeoning damage.

Legendary Actions

The diplodocus can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature’s turn. The diplodocus regains spent legendary actions at the start of its turn.

  • Move. The diplodocus moves up to half its speed.
  • Stomp (costs 2 actions). The diplodocus makes one stomp attack.
  • Whip Crack (costs 3 actions). The diplodocus whips its tail in the air, creating a thunderous crack. Each creature within 20 feet of it must succeed on a DC 17 Wisdom saving throw or take 14 (4d6) thunder damage and become frightened until the end of its next turn.
Section 15: Copyright Notice

City of Brass ©2018 Frog God Games; Authors: Casey Christofferson and Scott Greene