When you choose Drider, your may increase your CON by 2 and either your STR or DEX by 1.

Driders age similarly to other Drow elves

Driders tend towards evil or neutral alignments, although they may skew towards good after being shamed by Lolth

You are a medium creature. However, your size counts as large when determining carrying capacity, and push/pull/drag weight.

Your base walking speed is 30 feet. You also have a climbing speed of 30 feet and can climb on difficult surfaces and upside down on the ceiling without having to make a check.

You can speak, read, and write Common, Elvish, and Undercommon

Your heritage and upbringing in the Underdark grants you an improved darkvision out to 120 feet. You can see in dim light as if it were bright light and in darkness as if it were dim light. You do not see in color, but only shades of grey.

Your thick spider exoskeleton grants you a natural armor class of 13+CON. You can use your natural armor to determine your AC if the armor you wear would leave you with a lower AC. A shield's benefits apply as normal with natural armor.

You don’t need to sleep. Instead, you meditate deeply, remaining semiconscious, for 4 hours a day. (The Common word for such meditation is “trance.”) While meditating, you can still dream; such dreams are actually mental exercises that have become reflexive through years of practice. After resting in this way, you gain the same benefit that a person normally gets from 8 hours of sleep.

Your grotesque form grants you advantage on Charisma (Intimidation) checks, but disadvantage on Charisma (Persuasion) checks.

You can cast the cantrip "Poison Spray". 

At 3rd level, you can case the 2nd level spell "Web" one time without using material components.  Once you cast the spell in this way, you cannot do so again until you take a long rest.

You have disadvantage on attack rolls and Wisdom (Perception) checks that rely on sight when either you, the target of the attack, or what you are trying to perceive are in direct sunlight.