Dark Vision (60ft)
Innate Spellcasting
Magic Resistance -You have advantage on saving throws against spells and other magical effects
Poison Immunity - You are immune to poison damage and the poisoned condition
Hot Resistance: Yuan-ti ignores Extreme Heat Weather condition.
Cold sensitivity: Yuan-ti have disadvantage on saving throws against Extreme Cold Weather condition.

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Trained Infiltrator -Proficiency in stealth and Perception skills, expertise if already proficient
One shot, One kill - When you hit a creature with an aimed shot, you can force that creature to make a con save. On a failed save, you roll additional damage dice equal to your aimed shot dice rounded down.
You can use this feature a number of times equal to your proficiency bonus, and regain with a long rest.
Advanced Vision - Your eyes are extremely trained to see at multiple conditions. You may ignore any disadvantage on Wisdom (Perception) checks that rely on sight as long as you are not blinded, and have advantage on saving throws against the blinded condition.
Snipers Nest
Aimed Shot
Cunning Action
Placed Shot
Disappear - You are a true Master of stealth and capable of fading into thin air. As a reaction, when you take damage, you can use this ability to move up to 5ft without provoking oppotunity attacks and attempt to hide as part as the same reaction, if there's a hiding spot within reach.
You can also use this reaction if you make an attack while unseen.
Hawk Eye - you can see up to 1 mile away with no difficulty, able to discern even fine details as though looking at something no more than 100 feet away from you.
Additionally, you have advantage on your Wisdom (Perception) checks that rely on sight.

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Dual Personalities - Most of your fellow adventurers and the world know you as your persona. Those who seek to learn more about you-your weakness, your origins, your purpose-find themselves stymied by your disguise. Upon donning a disguise and behaving as your persona you are unidentifiable as your true self. By removing your disguise and revealing your true face, you are no longer identifiable as your persona. This allows you to change appearances between your two personalities as often as you wish, using one to hide the other or serve as convenient camouflage. However, should someone realize the connection between your persona and your true self, your deception might lose its effectiveness.
Observant
Street Smart