Shin Okada
Explorer
I am not sure if this prestige class was in 3.0e. But Dark Hunter (from Complete Warrior) can increase the range of Darkvison. Drow something x/Dark Hunter 4+ should have Darkvision 180 ft. Even a character with low-light vision using bullseye lantern cannot see that far in the dark. Make that drow an archer or a spellcaster. Let him (or her) lurk in darkness and use sniping/hit and away tactics. It will be really scaly.