Dragon Information

Damage determination:

To determine the damage of a breath attack, take the creature's hit points and divide by 3 (except in the case of Lightning, for which you should divide by 4.)

As for resistance, it depends on the type of attack:
Acid
Divide the damage by 2 if you have armor to corrode; divide by 4 if you have resist acid and armor.
Cold or Fire
Divide the damage by 3 if you have permanent or temporary resistance; divide by 9 if you have both.
Lightning
Divide the damage by 3 if you have any kind of resistance.
Gas
There is no resistance! You're hosed!


The Balrog:

Dragon Name
Hit Points
Level
Attack Type Maximum Damages
No protection Some protection Best protection
Balrog
Hit points: 3000
Level: 100
Fire 1000 333 111


Ancient Dragons:

Dragon Name
Hit Points
Level
Attack Type Maximum Damages
No protection Some protection Best protection
Ancient Multi-Hued
Hit points: 2080
Level: 40
Lightning 520 173 173
Acid 693 347 173
Fire/Cold 693 231 77
Gas 693 693 693
Ancient Red
Hit points: 840
Level: 40
Fire 280 93 31
Ancient Green
Hit points: 720
Level: 39
Gas 240 240 240
Ancient Black
Hit points: 720
Level: 39
Acid 240 120 60
Ancient Blue
Hit points: 696
Level: 39
Lightning 174 58 58
Ancient White
Hit points: 704
Level: 38
Cold 235 78 26


Mature Dragons:

Dragon Name
Hit Points
Level
Attack Type Maximum Damages
No protection Some protection Best protection
Mature Multi-Hued
Hit points: 640
Level: 38
Lightning 160 53 53
Acid 213 107 53
Fire/Cold 213 71 24
Gas 213 213 213
Mature Red
Hit points: 480
Level: 37
Fire 160 53 18
Mature Black
Hit points: 464
Level: 37
Acid 155 77 39
Mature Green
Hit points: 384
Level: 36
Gas 128 128 128
Mature Blue
Hit points: 384
Level: 36
Lightning 96 32 32
Mature White
Hit points: 384
Level: 35
Cold 128 43 14


Young Dragons:

Dragon Name
Hit Points
Level
Attack Type Maximum Damages
No protection Some protection Best protection
Young Multi-Hued
Hit points: 320
Level: 36
Lightning 80 27 27
Acid 107 53 27
Fire/Cold 107 36 12
Gas 107 107 107
Young Blue
Hit points: 33d8
Level: 36
Lightning 66 22 22
Young Red
Hit points: 288
Level: 35
Fire 96 32 11
Young Black
Hit points: 256
Level: 35
Acid 85 43 21
Young Green
Hit points: 32d8
Level: 29
Gas 85 85 85
Young White
Hit points: 32d8
Level: 29
Cold 85 28 9