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

Arachnids reach maturity around age 40 and live about twice as long as humans.

Arachnid usually are somewhat self-centered and focus on survival but seem to have a cruel sense of playfulness. The average Arachnid is either Lawful Evil, Chaotic Evil or Chaotic Neutral.

Arachnid stand between 6 and 7 feet tall, with their spider bodies reaching up about 4 feet in height. You are considered medium.

Your base walking speed is 40 feet. You have a base climbing speed equal to your base walking speed

Growing up in the underdark has caused you to be well adapted to dark environments. 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 grey

You can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

You can use your web in an aggressive manner. As an action, you can shoot a web at a creature. The web is considered a ranged weapon and has a range of 30/60. A creature hit by this is considered restrained. As an action, the restrained creature can make a Strength check against a DC to 8 + your proficiency modifier + your Intelligence modifier to break free of the restrain.
You can also use this trait and spend 10 minutes to create a web that is a 20 foot wide square that can be horizontal or vertical (considering there are supports).
Once you use this part of this trait you cant use it again until after a long rest.

When you reach 3rd level, you can cast the Web spell once without using a spell slot and regain the ability to do so when you finish a long rest. This spell doesn't count to your spells known and you may use a spell slot to cast this spell normally. Charisma is your spellcasting ability for this spell

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

Arachnid ignore movement restrictions caused by any magical or non-magical webbing

You have proficiency with Weaver's Tool's and can double your proficiency with checks using Weaver's Tools. You can use your webbing as a resource to weave objects with your webs. You can spend 1 hour during a short or long rest to craft clothes of many different makes that you have learned out of the material of your web. Your web is reinforced and incredibly strong. While wearing clothes made from your webbing, a creatures AC can be calculated as 12 + their dexterity modifier

You can speak, read & write Common and Undercommon

You are able to create a silk that acts like a rope. As an action you can create a spider silk from your body and use it like an improvised rope. Creatures are able to use them to climb, tie up or do any other actions that would require rope. Between Long rests you can create silks with a total length equal to 30 times your level