Seismosaurus (Dinosaur)

Seismosaurus is an enormous dinosaur that roams the earth during the late Jurassic period. This massive creature is the largest known dinosaur to have ever lived, measuring up to 150 feet in length and weighing up to 80 tons. Its long, slender body is supported by four powerful legs, each ending in three sharp claws that enable it to easily traverse the rough terrain it inhabits.

As its name suggests, Seismosaurus can create seismic waves that can be felt from miles away, thanks to the powerful vibrations produced by its massive footsteps. Its long, flexible neck allows it to graze on vegetation that is out of reach for most other herbivorous dinosaurs, and its sharp teeth make short work of any plant matter that it comes across.

Despite its massive size, Seismosaurus is a gentle giant that prefers to avoid conflict whenever possible. It moves slowly and deliberately, carefully surveying its surroundings for any signs of danger. However, when threatened, Seismosaurus can use its massive size and strength to fend off even the most formidable predators.

In conclusion, Seismosaurus is a truly remarkable creature that inspires awe and wonder in all who see it. Its massive size, strength, and unique abilities make it one of the most fascinating creatures to have ever walked the earth.

Seismosaurus 5e Stat Block

Gargantuan beast, unaligned

Armor Class	Hit Points	Speed
18 (natural armor)	330 (20d20 + 100)	40 ft.

STR	DEX	CON	INT	WIS	CHA
30 (+10)	10 (+0)|	24 (+7)	2 (-4)	12 (+1)	5 (-3)

Skills: Perception +8

Senses: passive Perception 18

Actions:

• Stomp. Melee Weapon Attack: +17 to hit, reach 15 ft., one target. Hit: 60 (8d12 + 10) bludgeoning damage.
• Tail Swipe. Melee Weapon Attack: +17 to hit, reach 20 ft., one target. Hit: 50 (6d10 + 10) bludgeoning damage.
• Trample. Seismosaurus moves up to its speed in a straight line and can move through the space of any creature of Huge size or smaller. Each creature in that line must make a DC 25 Dexterity saving throw, taking 60 (10d10 + 7) bludgeoning damage on a failed save, or half as much damage on a successful one.

Legendary Actions:

Seismosaurus 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. Seismosaurus regains spent legendary actions at the start of its turn.

• Tail Attack. Seismosaurus makes a tail attack.
• Shake the Ground (Costs 2 Actions). Seismosaurus stomps the ground with tremendous force, causing a tremor. Each creature within 60 feet of Seismosaurus must make a DC 25 Strength saving throw or be knocked prone.
• Trample Charge (Costs 3 Actions). Seismosaurus moves up to its speed in a straight line and can move through the space of any creature of Huge size or smaller. Each creature in that line must make a DC 25 Dexterity saving throw, taking 60 (10d10 + 7) bludgeoning damage on a failed save, or half as much damage on a successful one.

Challenge: 20 (25,000 XP)

Physical Description:

Seismosaurus is a massive herbivorous dinosaur, standing at over 100 feet tall and weighing several tons. Its long neck and tail are adorned with distinctive spines, and its four powerful legs end in large, clawed feet. Its scaly skin is a dark brown color, and its piercing eyes survey its surroundings with a mix of curiosity and caution. When it moves, the ground trembles beneath its feet, and its sheer size makes it an awe-inspiring sight to behold.

3.5 Stat Block

From ORC Wiki

Seismosaurus
Colossal animal
Hit Dice	32d8+300 (444 hp)
Initiative	-1
Speed	20 ft.
AC	11 (-8 size, -1 Dexterity, +10 natural), touch 1, flat-footed 11
Attacks	Tail slap +31 melee
Damage	Tail slap 4d10+22
Face/Reach	120 ft. /25 ft.
Special Attacks	Trample 10d10+22
Special Qualities	Darkvision 60 Ft., Low-Light Vision, Scent
Saves	Fort +27, Ref +17, Will +12
Abilities	Strength 40, Dexterity 9, Constitution 29, Intelligence 1, Wisdom 14, Charisma 14
Skills	Listen +22, Spot +21
Feats	Alertness, Awesome Blow, Diehard, Endurance, Improved Bull Rush, Power Attack, Run, Toughness x4
Climate/Terrain	Warm forests, plains, hills, and marsh
Organization	Solitary, pair, or pod (5-20)
Challenge Rating	12
Treasure	None
Alignment	Always neutral
Advancement	33-64 HD (Colossal)
Level Adjustment	–

Seismosaurus is the largest known of the dinosaurs. It feeds on plants, often defoliating several square miles of terrain within the course of a few weeks.

Seismosaurus is an immense four-legged dinosaur with a small head, a bulky body, and a long neck and tail. Its nostrils are located high up on its head.

COMBAT

Seismosaurus is simply too big to have natural enemies—it dwarfs even the likes of allosaurus and tyrannosaurus. Seismosaurus is more likely to inadvertently step on an opponent than to intentionally use its tail slap attack.

Trample (Ex): As a standard action during its turn each round, seismosaurus can trample opponents at least one size category smaller than itself. This attack deals 10d10+22 points of bludgeoning damage. A trampled opponent can attempt either an attack of opportunity at a -4 penalty or a Reflex save (DC 41) for half damage.