The "?!" shows my astonishment that a high level drow would wield a +1 rapier as his main weapon!
A rapier is the kind of sword that the three musketeers use.
Entreri appears first in the Icewinddale trilogy, book two. He´s considered to be Drizzt´s nemesis and vice versa. I have his stats somewhere but I can´t find them. Think he´s an assasin dualled to fighter but I´m not sure. For both Drizzt and Entreri goes that their pnp versiones have "special" abilities. Drizzt has stealth abilities ( 99% in climb walls, move silently, and hide in shadows as well as 60 % climb walls). He is also able to backstab (damage x 5) , If he hits by more than 5 he scores double damage (also for the backstab!!!) and has a 10% + 3%/level difference to target chance of killing the foe instantly!!
As you can see this fellow is a nasty opponent for even the mightyest party.