Basic Combat Rules (CWS)

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A dragon's armor class improves with each age category (level) it advances, as shown on TABLE 5: DRAGON INFORMATION BY AGE (TYPE SPECIFIC). Because of its great size, a dragon receives no additional defense bonuses or penalties due to its Dexterity score. Dragons that reach old age become immune to normal missiles such as arrows and other small projectiles. Large missiles (catapult stones, a giant's boulders, etc.) affect them normally. A dragon's personal resistance to harmful magic provides additional defense. This resistance also increases as a dragon ages, as shown on TABLE 5. 
Every dragon has a combat modifier that applies to damage rolls made for each physical attack (claws, bite, or physical combat proficiencies). These modifiers increase with the age of a dragon, as shown on TABLE 4. The combat damage modifier is not applied to breath weapon damage, or to damage caused by spells or innate abilities. If a dragon uses an attack routine for which it has no combat proficiency, then it suffers the nonproficiency penalty. (Note that some combat proficiencies cannot be used until they have been slotted.) See Chapter Two: Proficiencies and Abilities, and TABLE 10: DRAGON PROFICIENCY SLOTS, for more information. 
The combat modifier also adjusts a dragon's base spellcasting level to determine the level at which it casts its spells. For example, Cuthin the copper dragon is of juvenile age. His base spellcasting ability is at 7th level. His combat modifier at juvenile age is +4. Cuthin casts spells at 11th leyel (7+4=11). 
Once a dragon character takes the breath weapon combat proficiency, it has access to the breath weapon associated with its dragon type. (In the case of metallic dragons, who have two breath weapon types, they must purchase each type separately.) A dragon can use its breath weapon once every three rounds. So, if a dragon unleashes its breath weapon in the fust round of combat, it can breathe again in round 4, round 7, round 10, etc. In the same round in which a dragon uses its breath weapon, it can't make a physical attack or use a spell or innate ability. (See Chapter 1\vo for an optional breath weapon rule.) 
Innate abilities can be used at any time and in combination with physical attacks. Dragons casting spells cannot make any other kind of attack, use an innate ability, or fly (except to glide). Only one spell or spell-like ability can be used per round. 
==Dragon THAC0==
Dragon PC kits use a warrior's THAC0 of a level equal to the dragon's Hit Dice. Dragon-priest kits use the priest's THAC0, dragon -mages use the wizard's THAC0 line, and dragon-psionicists use the psionicist THAC0. See the Appendix at the end. See the Appendix at the end of the book for table 27 Dragon character THAC0s. 
For example, a juvenile sapphire dragon with 13 Hit Dice has a THAC0 of 8, 12, 16, or 14, depending on whether it is using the dragon, priest, mage, or psionicist kit.
==Dragons vs Weapons Immune Creatures==
Dragons can hit creatures that are immune to normal and certain magical weapons, depending on the dragons' Hit Dice total. This is outlined on the table that follows.
Dragon'sHit Dice	Can Hit CreaturesRequiring
4-5 	+1 weapon or better
6-7 	+2 weapon or better
8-9 	+3 weapon or better
10+ 	+4 weapon or better