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Altisaur

Gargantuan monstrosity (dinosaur), unaligned

Armor Class 15 (natural armor)

Hit Points 198 (12d20 + 72)

Speed 40ft

STR

28 +9

DEX

6 -2

CON

23 +6

INT

3 -4

WIS

12 +1

CHA

7 -2

Skills Perception +11 +5

Senses passive Perception 21

Challenge 13 (10,000 XP)

Magic Resistance. The altisaur has advantage on saving throws against spells and other magical effects.

Actions

Multiattack. The altisaur makes one Stomp attack and one Tail attack. The altisaur can't make both attacks against the same target.

Stomp. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 33 (7d6 + 9) bludgeoning damage. If the target is a Huge or smaller creature, it must succeed on a DC 22 Strength saving throw or have the Prone condition.

Tail. Melee Weapon Attack: +14 to hit, reach 20 ft., one target. Hit: 45 (8d8 + 9) bludgeoning damage, and the target is pushed up to 20 feet horizontally from the altisaur.

The altisaur is a titanic sauropod often likened to a walking mountain, with craggy spines, patterns of elemental energy that glow in its hide like streams of lava, and eight massive legs the size of ancient trees. It creates gullies where its tail drags along the ground. Clouds often seem to gather around its head, which can reach as high as 150 feet off the ground.