This creature resembles nothing so much as a reptilian rhinoceros, its head and neck are protected by a bony shield and its skin is very thick.
Originally Posted by Shade of the En World forums.
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The monoclonius is a species of ceratopsian, the most famous of which is the triceratops.
Most monoclonius are around 15 feet long and very strong, but the species are inoffensive and herbivorous. Most monoclonius live in family units with an alpha male and multiple females, as well as the alpha’s various offspring. Unlike triceratops, they are not particularly territorial or aggressive.
|Hit Dice||8d8+40 (76 hp)|
|Speed||30 ft. (6 squares)|
|Armor Class||16 (-1 size, +7 natural), touch 9, flat-footed 16|
|Attack||Gore +13 melee (2d6+10)|
|Full Attack||Gore +13 melee (2d6+10)|
|Face/Reach||10 ft./5 ft.|
|Special Attacks||Powerful charge, trample 2d6+10|
|Special Qualities||Low-Light Vision, Scent|
|Saves||Fort +11, Ref +6, Will +6|
|Abilities||Strength 24, Dexterity 10, Constitution 21, Intelligence 1, Wisdom 15, Charisma 5|
|Skills||Listen +10, Spot +9|
|Feats||Alertness, Iron Will, Weapon Focus (gore)|
|Environment||Temperate and warm plains|
|Organization||Solitary, pair or herd (3-12)|
|Advancement||9-16 HD (Large), 17-24 HD (Huge)|
If they or their offspring are threatened, a herd of monoclonius will charge the offending predator, impaling it on their powerful horns. They usually retreat if a fight goes badly, but a mother monoclonius will defend her child to the death.
Powerful Charge (Ex): When a monoclonius charges, its gore attack deals 4d6+14 points of damage.
Trample (Ex): A monoclonius can literally run over any creatures in its way that are of Medium or smaller size. Creatures trampled must make a Reflex save (DC 21 half) or take 2d6+10 damage. The save DC is Strength-based.
Originally appeared in Monster Manual (1977).