Actually... you better pray the Shadow Dragon never uses its' Dragon's Breath unless you have Level Drain Immunity. It Level Drains you by 10 Levels... ...
Personally though, I find the Shadow Dragon the easiest of them all. This is the Dragon I use for my experiments in trying out Dragon Slaying tips.
I rank the Dragons of SoA in the following difficulty, assuming your average party level is 15,
Silver Dragon
Shadow Dragon
Firkragg
Nine Hells Black Dragon
Elf City Black Dragon
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If not a Sorcerer casting total oblivion, then a Cavalier meting out justice. Otherwise, I think I will just be a Blade and torture my enemies with, "My Heart Will Go On".
Platinium Sorcerer of ALSB,
Aerie
Loving
Sacred
Band! She's MeowRrrr, and more!
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Sorcerer Spell List
Dragon Slaying Tips