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 colour in darkness, only shades of grey

As a Yuan Ti, you have innate talents in certain arts of the arcane that come from the Yuan Ti serpents. 

You know the Poison Spray cantrip. Starting at 3rd level, you can also cast Suggestion with this trait. Once you cast it, you can't do so again until you finish a long rest. You are considered trained in them and Charisma is your spellcasting ability for these spells.

Thanks to your serpent blood, poison has little effect against you.

You are immune to poison damage and the poisoned condition.

Your body has a natural resilience against magic thanks to your serpent blood.

You have a +1 to all saving throws against magic 

Yuan Ti are naturally deceitful creatures often being regarded as sly.

You have +2 for deception skills. 

Yuan-Ti have snake blood in them and can form bonds with such creatures

You can cast Animal Friendship or speak with animals an unlimited number of times with this trait, but you can target only snakes with it. 

Yuan Ti are remarkably fast and can react to dangers as soon as they materialise.

You gain advantage when rolling for initiatives.