Monsters / Hydra

Hydra

CR 4 - 1,200 XP - N Huge Magical Beast

Stat block

AC15 (touch 9, flat-footed 14)HP47 (5d10+20)SavesFort +8, Ref +7, Will +3Melee5 bites +6 (1d8+3)Speed20 ft., swim 20 ft.AbilitiesStr 17, Dex 12, Con 18, Int 2, Wis 11, Cha 9BAB / CMB / CMD+5 / +10 / 21Sensesdarkvision 60 ft., low-light vision, scent; Perception +10Environmenttemperate marshes

Combat brain - every behavior cites its line (3 rules)

Built only from this entry: stat-block special attacks, the printed Int score, the creature type, its feats and senses, and the behavioral prose of its own description. Nothing invented - an uncited behavior is a test failure.

pounce (from special_attacks)
special attacks: pounce - full attack (with rake) at the end of a charge
aoo-coverage (from feats)
feats: Combat Reflexes - movement through its reach is punished
night-hunter (from senses)
senses: darkvision 60 ft., low-light vision, scent; Perception +10 - hunts where prey is blind

On-hit riders and breath

pounce

From the entry

A hydra's fast healing ability is equal to its current number of heads (minimum fast healing 5). This fast healing applies only to damage inflicted on the hydra's body. A hydra can be killed by severing all of its heads or slaying its body. Any attack that is not an attempt to sever a head affects the body, including area attacks or attacks that cause piercing or bludgeoning damage. To sever a head, an opponent must make a sunder attempt with a slashing weapon targeting a head. A head is considered a separate weapon with hardness 0 and hit points equal to the hydra's HD. To sever a head, an opponent must inflict enough damage to reduce the head's hit points to 0 or less. Severing a head deals damage to the hydra's body equal to the hydra's current HD. A hydra can't attack with a severed head, but takes no other penalties. When a hydra's head is destroyed, two heads regrow in 1d4 round...