Well, if the "in" at the end of the word is pronounced as a long E, then the emphasis would have to go there as well, since you always place the accent on the long vowel. So, it would be e la DREEN.
However, since this is modern English, we don't pronounce "in" with a long e. This is English not Romaji.
So,by English standards, it would be e LAH drin, since three syllable words without a long vowel are almost always pronounced this way, with the accent on the middle syllable. ((note that syllable is an exception to this rule. I love English))
Also note, that Wulf's breakup of the syllables would be extremely hard to pronounce. eh LAD rin would mean that the d and the r would not be pronounced together.
Then again, until very recently, I pronounced Drizz't to sound like drizzle with a t on the end.