You can walk on difficult surfaces such as walls, or upside down on ceilings without needing to make an ability check, with your hands free and at full movement.

A Medium or smaller creature can ride on your abdomen if you allow it. In such a situation, you continue to act independently, not as a controlled mount. Unfortunately, you also cut your walking/climbing speed in half as spider legs aren't meant to carry massive loads.

You can produce webbing made of silk and use it as both a weapon, as a trap and for housing/bedding.You have 5 'charges' of webbing that you can use before having to take a short or long rest.

As a weapon, you can launch a ball of webbing at an enemy who then must make a Dex saving throw or be restrained. When restrained by webbing, one requires a strength check with a DC of 10 + dexterity modifier + Constitution Modifier to break free.

As a trap, the webbing has the same effects as the Web spell. The only difference is that the duration is 8 hours rather than 1 hour.

As housing/bedding, you require an hour to make a comfortable living space.

In order to fit into society away from the Drow and other Underdark Races, You have learned to hide your true self from others around you. You can cast Alter Self at will indefinitely or until you decide to deactivate it.

Your Dexterity score increases by 2, and your Wisdom score increases by 1

Although Driders reach physical maturity at about the same age as humans, the elven understanding of adulthood goes beyond physical growth to encompass worldly experience. A Drider typically claims adulthood and an adult name around the age of 100 and can live to be 750 years old.

The Drider are vicious and dangerous. Driders are more often evil than not.

Driders range from under 6 to over 8 feet tall and have slender builds for the top of their bodies. Your size is Medium.

You gain a walking speed of 30 ft and a climbing speed of 30 ft as well.

Accustomed to darkness and the never ending night sky, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.

You have proficiency in the Perception skill.

You have advantage on saving throws against being charmed, and magic can’t put you to sleep.

Driders don’t need to sleep. Instead, they meditate deeply, remaining semiconscious, for 4 hours a day. (The Common word for such meditation is “trance.”) While meditating, you can dream after a fashion; 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 human does from 8 hours of sleep.

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