Um, of COURSE you're having a heck of a time beating him.. There are ways to get around fighting the Shadow and Red dragons because entire PARTIES have a heck of a time beating them.. I'm sorry (or not) but unless you cheat and hack, I don't know if a solo thief can do it.. Do you have ToB installed? Maybe setting traps everywhere and the Use Any Item feat might help.. Then you could use scrolls of Time Stop and summoning all sorts of beasties.. But I've never dared try it on my own without being an epic-level char.
Maybe, just for this one fight, you might consider bringing some others along. Edwin and Jahiera come to mind, as they can summon monsters. Wands of Monster Summoning also come to mind.. Although if the dragon is immune to normal weapons it's mostly useless (Though you could hang back and shoot arrows while the Shady takes out the beasties.) But seriously, do consider bringing others along for the fight. The fight will be a challenge for a seasoned party.. One thief alone is dragon food.
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