Possible in-close dragon tactics, for when they can't take advantage of guerilla fighting:
- Grapple then crush spellcaster looking types. Mage HPs don't stand up well to 4d8+25 worth of otherwise unavoidable automatic damage every round (going off average great wyrm red stats).
- If it's in heavy armor and doesn't seem particularly speedy, espicially if it's a cleric snatch it, and fling it as far away from the rest of the group as you can. All those rounds of movement it spends to get back to its allies are rounds in which it's not healing a single dang thing.
- You have blindsight, they probably don't. Limit visibility with dust clouds, fog, darkness or whatever else you can.
- You have spells too. Use them. Gate or Summon in something to keep their melee from being able to focus on any one target... or if they do focus on just one target... make them regret it. Dispel their buffs. Use cold damage spells - Polar Ray on someone that has a spell that gave them the (Fire) subtype is worth a good long laugh. Maze things that look stupid.
- Two words, one colon. Contingency: Heal.
- Have something liquid nearby? Water, or better yet.. lava? Snatch and toss things that are bogged down in heavy armor into it and let nature take its course.
- Always have a way out. Nothing is worth dying for. Nothing. A flight route, teleport, etherialness, plane shift (to the plane of fire is a fun one.. follow that ya pesky humans). Have some ace up your sleeve just in case.
- You, as a dragon, control a vast hoard of wealth, very likely including several large gemstones. If you're about to die, cast Magic Jar on yourself and possess one. Your body falls over (as far as anyone can tell) dead, and while they're diivying up your swag, possess one of the weaker ones. The lower the potential will save the better. Then, whenever the opportunity arises, sneak back to your body and place your soul back where it belongs. If they made an effort to butcher your body, taking trophies (as dragon hunters almost always do...) cast Ressurection on one of those trophies. Once your wonderful self is intact again, end the magic jar and see how those adventuring types like a second go at you.
Notes to PCs: uh.. find ways to deal with all the stuff described above.