Your Dexterity score increases by 2, and your Constitution score increases by 1.

Arachnida mature early at only 2 weeks old. This is due to their short life span which can max out between 20-35 years.

Your size is Medium.

You have a walking speed of 35 ft. You also have a climbing speed of 35ft. Your spider-like legs allow you to climb on walls and surfaces with ease and without needing an ability check.

Your people roamed the darkest depths of the Caverns of Old. They are the hunters of those who hunt. A sight so superior even the arcane can't block their sight. You have  Darkvision up to 30ft. Treading the webs throughout the deep has made you proficient, and you also gain the ability Web Sense: While in contact with a web, the Arachnida knows the exact location of any other creature in contact with the same web.

Arachnida have a natural weapon which is their stinger. As an action you may make a melee attack with the stinger dealing 2d6 poison damage and causing the target to make a Con save. The DC would be 8 + your proficiency bonus + your Constitution modifier, if the creature fails they suffer from the Poisoned condition for 1 minute. This save can be repeated at the end of the creature's turn. You may use your stinger and it's effect once per long rest.

The Arachnida smirk at the sight of poison. Their affinity has made them adapt to poisons of the highest degree. You have resistance to poison damage and advantage with saving throws against poison.

You can speak, read, and write Common, Primordial, & Deep Speech.

You may cast the Web spell once per long rest, and it counts as a known spell for you. You may choose between charisma, wisdom, and intelligence as your spellcasting modifier for this spell.

The Arachnida ignores movement restrictions caused by webbing.

Your creature type is Monstrosity rather than Humanoid.