Fey Ancestry. The drider has advantage on saving throws against being charmed, and magic can't put the drider to sleep.

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:

At will: dancing lights,Entangle

1/day each: darkness, faerie fire

Spider Climb. The drider can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Sunlight Sensitivity. While in sunlight, the drider has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

Web Walker. The drider ignores movement restrictions caused by webbing.

Undead Fortitude. If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Multiattack. The drider makes three attacks, 2 claws attacks and one bite

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 2 (1d4) piercing damage plus 9 (2d8) poison damage.

Bone Claws. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) slashing damage

Web (Recharge 5–6). Ranged Weapon Attack: +5 to hit, range 30/60 ft., one creature. Hit: The target is restrained by webbing. As an action, the restrained target can make a DC 14 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 10; hp 5; vulnerability to fire damage; immunity to bludgeoning, poison, and psychic damage).

The Drider can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The Drider regains spent legendary actions at the start of its turn.

Spider vomit. (Costs 3 actions)  The Drider throws up a colony of spiders summoning a Spider swarm in an adjacent square

Claw Attack. The Drider makes a Claw attack.

Cast a spell (Costs 2 Actions). The Drider may cast a spell from their "innate Spellcasting" trait