Dracohydra
Dragon (Air)

Climate/Terrain: Any land and underground
Organization: Wyrmling, very young, young, juvenile, and young adult: solitary or clutch (2-5); adult, mature adult, old, very old, ancient, wyrm, and great wyrm: solitary
Challenge Rating: Wyrmling 4; very young 5; young 7; juvenile 9; young adult 11; adult 13; mature adult 15; old 17; very old 19; ancient 21; wyrm 23; great wyrm 25
Treasure: Double standard
Alignment: Always chaotic evil
Advancement: Wyrmling 5-6 HD (Small); very young 8-9 HD (Medium-size); young 11-12 HD (Medium-size); juvenile 14-15 HD (Large); young adult 17-18 HD (Large); adult 20-21 HD (Huge); mature adult 23-24 HD (Huge); old 26-27 HD (Huge); very old 29-30 HD (Huge); ancient 32-33 HD (Gargantuan); wyrm 35-36 HD (Gargantuan); great wyrm 38+ HD (Gargantuan)

Dracohydras are among the most dangerous dragons to civilization and the local ecology.  They are bestial but have great ambition and cunning.
           A dracohydra is immediately distinguishable by the three to five heads. Tales are told of seven or even nine headed dragons but there is currently no positive evidence of their existence.  Dracohydras have long necks, two or more tails, and a thick body.  Their scales are a dark greenish black, typically fading with age.  Their eyes are amber or red.  An acrid smell hangs about the creature often mixed with the scent of raw meat.
          Dracohydras usually lair in whatever cavern-like structures they can conquer.  Caves, burrows, dungeons and fortifications are the most common lairs.  The most alarming thing is their habit of traveling in clutches when young.  Unlike other dragons, dracohydras never care for their young and instead leave their eggs in the wilderness. 
Dracohydras prefer to eat meat, usually kicking and screaming.  They have no treasure preference, instead wanting everything.

Combat
Dracohydras prefers to ambush their victims, lurking behind whatever cover they can find. Once engaged in combat they attempt to inflict as much carnage as possible.
     
Breath Weapons (Su): A dracohydra breathes a line of lightning.
     Multiple Heads (Ex):  A dracohydra has 1d3+2 heads at birth.  Each can deliver a bite attack or release a breath weapon independently. Each head requires 1d4 rounds between breath weapon attacks.  A head may be �killed� by dealing 1/3 of the dragons total hit points to that head exclusively.  It revives in 1d4 days.
     
Spell-Like Abilities: 3/day-wall of fog, darkness, 2/day-stinking cloud, 1/day-cloudkill, and horrid wilting.

GM�s Commentary:
The dracohydra is just one of those monsters that look it would be fun to use.
Dracohydra By Age

Age               Size    Hit Dice      AC                                   Attack  Fort   Ref   Will  Breath            Fear   SR
                                (hp)                                                        Bonus  Save  Save Save Weapon (DC) DC

Wyrmling        S     4d12+4          14 (+1 size, +3 natural )  +6         +5     +4      +4     1d4 (13)           --        --
                                (30)
Very young    M    7d12+14        16 (+6 natural )                +9        +7     +5       +5     2d4 (15)          --        --
                                (59)
Young             M    10d12+30      19 (+9 natural )               +13      +10   +7       +7     3d4 (18)          --        --
                                (95)
Juvenile          L      13d12+52      21 (-1 size, +12 natural ) +16     +12   +8       +8     4d4 (20)          --        --
                                (136)
Young adult    L      16d12+64     24 (-1 size, +15 natural ) +20     +14   +10     +10    5d4 (22)         19      18
                                (168)
Adult              H     19d12+95     26 (-2 size, +18 natural ) +24     +16   +11     +12    6d4 (24)         20      19
                                (218)
Mature adult  H     22d12+110   29 (-2 size, +21 natural ) +29     +18   +13     +14    7d4 (26)          23      21
                                (253)
Old                 H     25d12+150   32 (-2 size, +24 natural ) +33     +20   +14     +15    8d4 (28)         24      22
                                (312)
Very old         H     28d12+196   35 (-2 size, +27 natural ) +37     +23   +16     +17    9d4 (31)         27      24
                               (378)
Ancient          G     31d12+248   36 (-4 size, +30 natural ) +39     +25   +17     +19   10d4 (33)        28      25
                               (449)
Wyrm            G     34d12+306   39 (-4 size, +33 natural ) +43     +28  +19      +21   11d4 (36)        31      27
                               (527)
Great Wyrm G      37d12+370   42 (-4 size, +36 natural ) +47     +30  +20     +23    12d4 (38)        33       28
                               (610)

Dracohydra Abilities By Age

Age                 Speed                              Str Dex Con Int Wis Cha   Special Abilities      Caster Level
Wyrmling       40ft, Fly 100 ft (poor)      13   10    13     6     11    8     Acid Immunity                  --
Very Young    40ft, Fly 100 ft (poor)      15   10    15    6      11    8                                               --
Young             40ft, Fly 100 ft (poor)      17   10    17    6      11   10                                              --
Juvenile          40ft, Fly 150 ft (poor)      19   10    19     8     11   10    Wall of Fog                        --
Young adult   40ft, Fly 150 ft (poor)       21   10   19     8     11   12     Damage Reduction 5/+1    --
Adult             40ft, Fly 150 ft (poor)       25   10   21    10    13   12     Darkness                           --
Mature adult 40ft, Fly 150 ft (poor)       29   10   21    12    13   14     Damage Reduction 10/+1 1st
Old                40ft, Fly 150 ft (clumsy)   31   10   23    12    13   14     Stinking Cloud                  3rd
Very old        40ft, Fly 150 ft (clumsy)   33   10   25   14     13   16     Damage Reduction 15/+2 5th
Ancient         40ft, Fly 150 ft (clumsy)   35   10   27   14     15   16     Cloudkill                           7th
Wyrm           40ft, Fly 150 ft (clumsy)   37   10   29   14     15   18     Damage Reduction 20/+3 9th
Great wyrm 40ft, Fly 200 ft (clumsy)    39   10   31   16     17   20     Horrid wilting                 11th
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