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Large monstrosity, chaotic evil
Innate Spellcasting. The drider's innate spellcasting ability is Wisdom (spell save DC 13). The drider can innately cast the following spells, requiring no material components:
Spider Climb. The drider can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Web Walker. The drider ignores movement restrictions caused by webbing.
Multiattack. The drider makes three attacks, either with its longsword or its longbow. It can replace one of those attacks with a bite attack.
Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 2 (1d4) piercing damage plus 9 (2d8) poison damage.
Longsword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) slashing damage, or 8 (1d10 + 3) slashing damage if used with two hands.
Longbow. Ranged Weapon Attack: +6 to hit, range 150/600 ft., one target. Hit: 7 (1d8 + 3) piercing damage plus 4 (1d8) poison damage.
When a drow shows great promise, Lolth summons it to the Demonweb Pits for a test of faith and strength. Those that pass the test rise higher in the Spider Queen's favor. Those that fail are transformed into driders—a horrid hybrid of a drow and a giant spider that serves as a living reminder of Lolth's power. Only drow can be turned into driders, and the power to create these creatures resides with Lolth alone.
Scarred for Life. Drow transformed into driders return to the Material Plane as twisted and debased creatures. Driven by madness, they disappear into the Underdark to become hermits and hunters, either wandering alone or leading packs of giant spiders.
Variant: Drider Spellcasting
Driders that were once drow spellcasters might retain their ability to cast spells. Such driders typically have a higher spellcasting ability (15 or 16) than other driders. Further, the drider gains the Spellcasting trait. A drider that was a drow divine spellcaster, therefore, could have a Wisdom of 16 (+3) and a Spellcasting trait as follows.
Cantrips (at will): poison spray, thaumaturgy