Ability Score Increase. Your Dexterity score increases by 2, and your Wisdom score increases by 1

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 gain proficiency in one skill of your choice, from: Acrobatics, Intimidation, Perception, Stealth, or Survival.

You have a climb speed equal to your walking speed. You can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check. Additionally, you ignore movement restrictions caused by webbing.

At level 3 you learn the spell web, it doesn't count against your spells prepared. your spell casting modifier (wis, int, cha) is your spellcasting ability for this spell. you can cast the spell using your spell slots as normal.

You can speak, read, and write Common and Undercommon

Some people my see you as a monstrosity however, Your creature type is humanoid.

due to your lower body you cannot make use of mounts that do not accommodate your lower body.

You count as one size larger when determining your carrying capacity and the weight you can push, drag, or lift.

Arachne can be up to 7-8 feet tall and almost as wide. Your size is Medium

Arachne, much like spiders, mature quickly, becoming adults at the age of 2 or 3 and having lifespans comparable to humans