BOZ
Creature Cataloguer
i'm in the process of converting the dracohydra; tell me what you think. 
DRACOHYDRA
Dragon (Water)
Climate/Terrain: Temperate and cold mountains
Organization: (Needs to be fixed) (1-4)
Challenge Ratings: (Needs to be fixed)
Treasure: Double Standard
Alignment: Always chaotic evil
Advancement: (Needs to be fixed)
Dracohydras are hideous creatures that combine the worst aspects of hydrae and evil dragons. Their origin is clouded in mystery, and it is not believed that they are a result of the two species mating. Some sages consider them an evolutionary throwback, while others consider them a next step in dragon evolution. Another theory with much credence suggests that they are actually the result of experiments by evil deities, or even Tiamat herself.
Dracohydras have muddy brown scales, with a nearly cream-colored brown on their underbellies. They have draconic wings, and have from two to five heads. Their eyes glow red.
Dracohydras lair fair from civilization, usually in inaccessible mountain passes covered in snow, or in similarly barren areas. Like white dragons, they are avaricious, selfish, and vicious, avoiding plans and acting in a direct manner. They often kill for sport, and act as sadistic bullies in their territory, though they are truly cowards against superior foes. Dracohydras hate all other dragon types and will kill any they encounter if they think they can get away with it. They tend to enslave humanoids for a brief time before eating them. Their main enemies are storm giants and stone giants, though they hate red dragons who eat their young. These voracious monsters can eat nearly anything, including rocks and gems.
Dracohydras only speak Draconic.
COMBAT
Dracohydras, as expected, combine the best fighting capabilities of dragons and hydras. Each head can use its breath weapon independently each round. It can attack with any head that does not use its breath weapon at no penalty, even if the monsters moves or charges during the round.
A dracohydra can be killed either by severing all of its heads or by slaying its body. To sever a head, an opponent must hit the monster’s neck with a slashing weapon and deal damage equal to the hydra’s original hit point total, divided by its original number of heads, in one blow. (See the entry for hydras in the Monster Manual for more information.)
Breath Weapon (Su): A dracohydra has one type of breath weapon, a line of acid.
Other Spell-Like Abilities: 3/day - darkness; 2/day – stinking cloud, wall of fog; 1/day – cloudkill.
Immunities (Ex): Dracohydras are immune to acid.
Skills: Dracohydras receive a +2 racial bonus to Listen and Spot checks, thanks to their multiple heads.
Feats: A dracohydra with the Combat Reflexes feat is capable of using all its heads for attacks of opportunity each round.
The dracohydra first appeared in FOR1 Draconomicon, 1990.
DRACOHYDRA
Dragon (Water)
Climate/Terrain: Temperate and cold mountains
Organization: (Needs to be fixed) (1-4)
Challenge Ratings: (Needs to be fixed)
Treasure: Double Standard
Alignment: Always chaotic evil
Advancement: (Needs to be fixed)
Dracohydras are hideous creatures that combine the worst aspects of hydrae and evil dragons. Their origin is clouded in mystery, and it is not believed that they are a result of the two species mating. Some sages consider them an evolutionary throwback, while others consider them a next step in dragon evolution. Another theory with much credence suggests that they are actually the result of experiments by evil deities, or even Tiamat herself.
Dracohydras have muddy brown scales, with a nearly cream-colored brown on their underbellies. They have draconic wings, and have from two to five heads. Their eyes glow red.
Dracohydras lair fair from civilization, usually in inaccessible mountain passes covered in snow, or in similarly barren areas. Like white dragons, they are avaricious, selfish, and vicious, avoiding plans and acting in a direct manner. They often kill for sport, and act as sadistic bullies in their territory, though they are truly cowards against superior foes. Dracohydras hate all other dragon types and will kill any they encounter if they think they can get away with it. They tend to enslave humanoids for a brief time before eating them. Their main enemies are storm giants and stone giants, though they hate red dragons who eat their young. These voracious monsters can eat nearly anything, including rocks and gems.
Dracohydras only speak Draconic.
COMBAT
Dracohydras, as expected, combine the best fighting capabilities of dragons and hydras. Each head can use its breath weapon independently each round. It can attack with any head that does not use its breath weapon at no penalty, even if the monsters moves or charges during the round.
A dracohydra can be killed either by severing all of its heads or by slaying its body. To sever a head, an opponent must hit the monster’s neck with a slashing weapon and deal damage equal to the hydra’s original hit point total, divided by its original number of heads, in one blow. (See the entry for hydras in the Monster Manual for more information.)
Breath Weapon (Su): A dracohydra has one type of breath weapon, a line of acid.
Other Spell-Like Abilities: 3/day - darkness; 2/day – stinking cloud, wall of fog; 1/day – cloudkill.
Immunities (Ex): Dracohydras are immune to acid.
Skills: Dracohydras receive a +2 racial bonus to Listen and Spot checks, thanks to their multiple heads.
Feats: A dracohydra with the Combat Reflexes feat is capable of using all its heads for attacks of opportunity each round.
The dracohydra first appeared in FOR1 Draconomicon, 1990.
note though; it does not cast any spells (though it does have spell-like abilities). besides the original Draconomicon, it also appeared in Cult of the Dragon if you have that.
