pawsplay
Hero
Just for fun.
Hydra CR 37
XP ??
N Huge magical beast
Init +1; Senses darkvision 60 ft., low-light vision, scent; Perception +24
Defense
AC 48, touch 9, flat-footed 47 (+1 Dex, +39 natural, –2 size)
hp 437 (38d10+228); fast healing 38
Fort +26, Ref +15, Will +15
Offense
Speed 30 ft., swim 20 ft.
Melee 38 bites +40 (2d6+5/19-20, stun DC 50)
Space 15 ft.; Reach 10 ft.
Special Attacks pounce
Statistics
Str 21, Dex 12, Con 20, Int 2, Wis 12, Cha 10
Base Atk +38; CMB +45; CMD 56 (can't be tripped)
Feats Combat Reflexes, Iron Will, Lightning Reflexes, Improved Natural Attack (bite), Snatch, Weapon Focus (bite), Improved Critical (bite), Alertness, Athletic, Stand Still, Critical Focus, Stunning Critical, Endurance, Diehard, Lunge, Step Up, Toughness, Fleet (x2)
Skills Climb +21, Perception +24, Sense Motive +3, Swim +24; Racial Modifiers +2 Perception
SQ hydra traits, regenerate head
Ecology
Environment temperate marshes
Organization solitary
Treasure standard
Special Abilities
Fast Healing (Ex) 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.
Hydra Traits (Ex) 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.
Regenerate Head (Ex) When a hydra's head is destroyed, two heads regrow in 1d4 rounds. A hydra cannot have more than twice its original number of heads at any one time. To prevent new heads from growing, at least 5 points of acid or fire damage must be dealt to the stump (a touch attack to hit) before they appear. Acid or fire damage from area attacks can affect stumps and the body simultaneously. A hydra doesn't die from losing its heads until all are cut off and the stumps seared by acid or fire.
Hydra CR 37
XP ??
N Huge magical beast
Init +1; Senses darkvision 60 ft., low-light vision, scent; Perception +24
Defense
AC 48, touch 9, flat-footed 47 (+1 Dex, +39 natural, –2 size)
hp 437 (38d10+228); fast healing 38
Fort +26, Ref +15, Will +15
Offense
Speed 30 ft., swim 20 ft.
Melee 38 bites +40 (2d6+5/19-20, stun DC 50)
Space 15 ft.; Reach 10 ft.
Special Attacks pounce
Statistics
Str 21, Dex 12, Con 20, Int 2, Wis 12, Cha 10
Base Atk +38; CMB +45; CMD 56 (can't be tripped)
Feats Combat Reflexes, Iron Will, Lightning Reflexes, Improved Natural Attack (bite), Snatch, Weapon Focus (bite), Improved Critical (bite), Alertness, Athletic, Stand Still, Critical Focus, Stunning Critical, Endurance, Diehard, Lunge, Step Up, Toughness, Fleet (x2)
Skills Climb +21, Perception +24, Sense Motive +3, Swim +24; Racial Modifiers +2 Perception
SQ hydra traits, regenerate head
Ecology
Environment temperate marshes
Organization solitary
Treasure standard
Special Abilities
Fast Healing (Ex) 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.
Hydra Traits (Ex) 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.
Regenerate Head (Ex) When a hydra's head is destroyed, two heads regrow in 1d4 rounds. A hydra cannot have more than twice its original number of heads at any one time. To prevent new heads from growing, at least 5 points of acid or fire damage must be dealt to the stump (a touch attack to hit) before they appear. Acid or fire damage from area attacks can affect stumps and the body simultaneously. A hydra doesn't die from losing its heads until all are cut off and the stumps seared by acid or fire.
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If I wanted a serious threat, I'd have started with a fiendish half-dragon pyrohydra or something. Still, the charm monster plan has its limits; it's save is not bad against a spell of that level, so you might have to burn through quite a few, especially in a combat situation, and if the thing ever got loose, well. I think it would stand up perfectly well as a helper monster in a CR 40 encounter. Even if you charmed it, it would just resort to using Stand Still to keep you from fighting its other friends. 
