Among the dark elves, otherwise known as Drow, there are those touched the their goddess Lolth, whom inhabits the Demonweb pits of the Abyss.  Those that receive her blessing are known to have great power, and those that disappoint her are known to become the cursed Drider, half drow and half giant spider.

Expanded Spell List

Spell Level	Spells
1st	animal friendship, bane
2nd	protection from poison, silence
3rd	conjure animals (2 giant spiders), dispel magic
4th	divination, freedom of movement
5th	insect plague, mass cure wounds

Child of Lolth

Your family may rejoice, for you have been summoned to the Demonweb Pits and passed your test.  You have been blessed, you gain the two following cantrips: poison spray, thaumaturgy

Dark Blessing

At level 6 you may select two options from the Dark Blessings list.

Charge

As your action you can dash and attack once.

Leadership

Once per short rest, for 1 minute, you can utter a special command or warning whenever a friendly creature that you can see within 30 feet of you makes an attack roll or a saving throw. The creature can add 1d4 to its roll provided it can hear and understand you. A creature can benefit from only one Leadership die at a time. This effect ends if you are incapacitated.

Multiattack

You can make two melee attacks as your attack action.

Parry

You add 3 to your AC against one melee attack per turn that would hit. To do so, you must be able to see the attacker and be wielding a melee weapon.

Redirect Attack

When a creature you can see targets you with an attack, you choose a friendly creature within 5 feet of you and swap places, the chosen creature becomes the target instead.

Shadow Stealth

While in dim light or darkness, you can use a bonus action to Hide.

Web Sense

While in contact with a web, you know the exact location of any other creature in contact with the same web.

Drider, Curse of the Spider Queen

At level 10, though you were once blessed by Lolth you have disappointed her and must now be punished.  She has transformed you into a Drider.  The lower half of your body has been transformed into that of a giant spider, you serve as a warning to any Drow that dare to fail the Demon Queen of Spiders.

• You are a Large Monstrosity.
• You gain the ability to spider climb over difficult terrain, up walls, or on ceilings.
• You ignore movement restrictions caused by webbing.
• You have a bite attack that injects your target with venom.
• Your exoskeleton adds 3 to your unarmored armor class.

Lolth’s Fickle Favor

At level 14, though Lolth has cursed you and turned you into a Drider, she has chosen to grant you additional blessings to use in her service.

Once per short rest you can use a venomous bite that does 5d6 poison damage on a failed Constitution save versus your spellcasting ability.

You can attempt to summon a yochlol, a demon that serves Lolth in her demonweb pits, with a 50 percent chance of success. If the attempt fails, you take 1d10 psychic damage. Otherwise, the summoned demon appears in an unoccupied space within 60 feet of you, acts as an ally, and can’t summon other demons. It remains for 10 minutes, until you die, or you dismisses it as an action.

You can also shoot webbing a number of times equal to your Constitution modifier per long rest that can restrain a target or create 15 feet of path anchored to a point up to 60 feet away.