Starbuck_II, which book is Shivering Touch from?
Frostburn. Lesser Shivering Touch does 1d6 dex damage. Shivering Touch does 3d6.
If need scrolls of it:
Cheaper to use 2-3 lesser scrolls.
What magic items do you have? They may help.
Geez, did you really say Mature or old?
300+ hps...this will be a long battle. He will have between 14-16 Reflex save so he'll fail below 50% against you I think depending on your DC.
SR about 23-24. So at 17th caster you can ignore it, 70% of time.
He seems to be huge or gargantuan:
2nd: Resist Energy
3rd level: Displacement,
4th level: Greater Invisibility, Polymorph,
Resist energy while useful won't be as good as a Protection from energy spell versus 1 big breath attack.
Since dragons get spellcasting he is likely to have see invisibility, but Displacement won't be nullified.
That will help to protect you from being pounded.
If your blasting spells don't work for some reason (Control spells like grease won't be as useful because he can fly), could try melee.
Ray of Enfeeblement would be good here.
If you must go melee him:
Cast Displacement, Resist fire, if it went down Superior Resistance should be up from time you wake up (a given I'd think), and then go Aspect ofr Silver Dragon
8th level: Summon Monster VIII
Idea:
If you get a round before combat cast Summon Monster VIII to summon 1d41+1 Huge Monstrous Spiders.
Have all of them use their web attack (keep them spead out so he can't kill them with break weapon) to entangle the dragon multiple times: their effects should overlap.
But this means he will be penalized until he breaks free of each single webbing (he will make Str check, but he waste his action if he does). Example, if you summon 4 spiders: they each web him.
He has 4 webs on him: he has to seperately break each one or stays entangled.
Entangle lowers his attack bonus, Dex bonus (thus his Reflex Saves), etc.
The spiders will die in a single breath attack so keep them far away from each over as possible so he can kill 1 at a time at most.
You could send the spiders to aid another you (raise your attack or defense) or attack the Dragon (but he will only fail poison DC on a low roll).
Idea 2:
Sting ray (2nd level in Spell Compendruim) spell lowers his AC and restrict him to a standard action or move each round: this will lower his AC if you decide to go melee or ray spell him.
Idea 3:
Shadow Spray (2nd level in Spell Compendruim)- If he fails save deals 4 Str danage and dazes for 1 round: Either way, Each round the area gets hit again until duration up.
Now, now backback if he will make save and move more than likely (small chance he will fail DC). But hey, useful if you can keep him from moving.
Idea 4:
Earthbind spell blocks his ability to fly. Granted, he'd need a lower save to fail. Something like Limited Wish to lower his saves by 7 or something.
Then suround him and him his area with Shadow Spray...he won't be able to move through you guys or fly...
He will just take the beating.
Idea 5:
Scale Weakening lowers his Natural armor (no save) by 1/3 levels (max 5)so you'd lower it by 5. This will be useful to cast before fighting him in dragon form.
Idea 6;
Can a weapon: cast infernal Wounds on the weapon: smack the dragon. He bleeds 2 hp/round, he needs a cure spell, the Heal spel, or the Heal skill to stop the bleeding.
Idea 7: Ray of Dizziness: he can take a move or standard action only (no save). Meaning he can't full attack also.
Idea 8:
Antidragon Aura (3rd level spell): protects you from dragons: luck bonus to AC and Saves from Dragons (spell, fear affect, Breeath, etc)
Idea 9:
Array Spell resistance: Gives you bonus to SR checks.
Idea 10:
Use Limited wish to emulate the 2nd level Druid spell Blinding Spittle (no save).
Idea 11:
Aura of Evasion: Gain Evasion versus Breath weapon. Useful.
Idea 12:
Stun Ray (7th level spell): Save succeed =Stunned 1 round, fail 1d4+1 rounds.
Idea 13:
Hide from Dragons is like Invisibility (not Greater, so attacking ruins it) to Dragons: they cannot by any means detect you.