I’ll wrap up “Drow Week” with the drider, a centaur-like monstrosity with the head and torso of a drow and the thorax and abdomen of a giant spider. (In both centaurs and driders, the torso of the humanoid replaces the head of the beast, creating a creature with, presumably, two whole cardiopulmonary systems. We’re probably better off not thinking about this too much.)
Driders, according to the Monster Manual flavor text, are debased creations of the goddess Lolth, presumably produced with some frequency as pious drow fail the challenges of the Demonweb Pits. The text says nothing about whether driders reproduce to create new generations of driders; I’m going to go on the assumption that they don’t, meaning that they’re not evolved creatures. Because of the means of their creation, they may or may not have a strong self-preservation impulse—some of them may even have a death wish.
Driders are fighting machines. They have high Strength, high Dexterity and exceptional Constitution, suiting them for any sort of combat—ranged or melee, ambush or assault, swift or prolonged. They have a triple Multiattack with either longsword or longbow and can replace one of either of those attacks with a poisonous bite. However, based on their proficiency in Stealth, let’s say they prefer to start combat with a surprise attack. Their Spider Climb ability allows them to maneuver along walls and ceilings, and their Web Walker ability lets them ignore movement penalties from the webs of giant spiders. (They do not, however, have the ability to create webs themselves. Why not, I wonder?) They’re strictly nocturnal and/or subterranean, having both 120-foot darkvision and Sunlight Sensitivity.