General Rules: Monsters - Pachycephalosaurus

Pachycephalosaurus (from Dragon Magazine #318)
Large Animal

Hit Dice: 7d8+56 (87 hit points)
Initiative: -1
Speed: 40 feet
Armor Class: 18 (-1 size, +1 Dex, +10 natural); touch 8, flat-footed 18
BAB/Grapple: +5/+16
Attack: Head butt +11 melee (1d6+10, bludgeoning, 20 x2)

Full Attack: Head butt +11 melee (1d6+10, bludgeoning, 20 x2)

Space/Reach: 10 feet by 10 feet/5 feet
Special Attacks: Powerful charge, stun
Special Qualities: Low-light vision, scent
Saves: Fortitude +13, Reflex +4, Will +2
Abilities: Str 25, Int 2, Wis 10, Dex 8, Con 26, Cha 14

Skills: Spot +10

Feats: Improved Bull Rush, Improved Overrun, Power Attack
Environment: Temperate hills
Organization: Solitary, pair, or pack
Challenge Rating: 6
Treasure: None
Alignment: Always neutral
Advancement: 8 - 14 Hit Dice (Large), 15 - 21 Hit Dice (Huge)

Although herbivores, pachycephalosauruses are notoriously-bad tempered, and often attack without provocation.

These strange dinosaurs are often found dwelling in hills or badlands, where they travel in packs led by a dominant male. When two groups meets, the males in each pack invariably challenge each other to contests of dominance. These conflicts, in which two bull dinosaurs repeatedly charge at each other in an attemtp to head butt the other into submuission, generate thunderous cracking sounds that can be heard for miles.

A pachycephalosaurus is usually 15 feet long and usually weighs around 800 pounds.

Combat
A pachycephalosaurus incited to attack - often by something as minor as merely ap[proaching within charging range - invariably starts combat with a charge. They usually attack every other round, maneuvering to set up a new charge in the off rounds.

Powerful Charge (Ex): When a pachycephalosaurus charges, its head butt attack deals 2d6+10 points of bludgeoning damage.

Stun (Ex): A creature that is critically hit by a pachycephalosaurus must make a successful DC 20 Fortitude save or be stunned for 1d4 rounds. The save DC is Strength-based.

Pachycephalosauruses as Animal Companions
If raised from an egg, a pachycephalosaurus can be trained using Handle Animal. A 10^th-level druid, 12^th-level outdoorsman, or 10^th-level ranger may take a pachycephalosaurus as an animal companion.

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