Diplodocus
Gargantuan Beast
Armor Class 14
Hit Points 139 (9d20+45)
Speed walk +30
Challenge 7
STR
24
+7
DEX
8
-1
CON
20
+5
INT
2
-4
WIS
12
+1
CHA
5
-3
Senses passive Perception 11
Actions
Multiattack. The diplodocus makes a stomp attack and a tail attack against two different targets.
Stomp. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 21 (4d6 + 7) bludgeoning damage.
Tail. Melee Weapon Attack: +10 to hit, reach 15 ft., one target. Hit: 17 (3d6 + 7) bludgeoning damage. If the target is a Large or smaller creature it is pushed 10 feet away from the diplodocus and knocked prone.
Source: Level Up Advanced 5e Monstrous Menagerie · OGL/Open