You’re Dexterity score increases by 2 and you’re Intelligent score increases by 1

Arachnids reach maturity around the age of 20 and live usually twice as long as Humans

Arachnids tend to be the same size as Humans but some females grow even larger

You have a basic walking speed of 35 ft and an equally fast Climbing speed

You can see in dim light within 60 ft of you as if it were bright light and and in darkness as if it were dim light. You can’t discern colours in darkness, only shades of gray.

You’re climbing does not require any extra movement and you can move up, down, on vertical surfaces and along the ceiling without using you’re hands. 

As an action you are able to create silk that functions kind of like a rope. You are able to decide if the silk is sticky or not. If it is not it functions like a normal rope if it is you are able to restrict a creature that fails a roll (DC equal to 10 + you’re dexterity modifier). As a Bonus action you are able to pull a restricted creature 10 ft towards you. You can use the silk only once per long rest and it is as Long as you’re walking speed.

If you are falling you can use youre reaction to catch yourself if there is anything in the range of you’re silk and with a successful DC 12 Dexterity saving throw

When you reach 3rd lvl you are able to cast the Web spell once per long rest. Intelligence is you’re spell casting ability for this spell.

You ignore all restrictions given to you by the Web spell

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