As an Arachnoid you can Read, write, and Speak Common, and can Read, Write, and Speak one extra language

When determining your character's ability scores, increase one score by 2 and increase a different score by 1, or increase three different scores by 1. Follow this rule regardless of the method you use to determine the scores, such as rolling or point buy. The "Quick Build" section for your character's class offers suggestions on which scores to increase. You can follow those suggestions or ignore them, but you can't raise any of your scores above 20.

Your size is Medium

Your walking speed is 30 feet

A Arachnoid can live up to 140 years and are adults at 16

You have immunity against poison damage.

You can Climb up to 35 feet, you also gain access to the 2nd Level Spider Climb[Spell] once per long rest.

Being born with the legs of an Arachnid you can strike your opponent with the ends of your legs having 10 feet of range being able to do 1d8 piercing damage. (This can be treated as either only one attack or as a Duel Weilding attack, optimal by the Dungeon Masters choice)

You have a radius of 120 feet darkvision

As an arachnoid you are either born a Pureblood or Monstrosity.

Pureblood: you carry Spider like eye, sharp teeth, small details of spider like skin and Arachnid legs on your back to use to climb or attack.

Monstrosity: Your eyes are spider like, more spider like mouth, heavy spider formed skin, and you now have Arachnid legs instead of humanoid legs.

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