You get a plus 2 to wis, and a plus 1 to dex

Dvati are one soul and mind split between 2 bodies. Your body has its own hit points and stats and what not, but your life force is tied to the other, if your twin hits 0, you gain an exhaustion level, and if your twin dies, you gain 5. All levels are removed when your twin has 1 hit point.

You have proficiency in one of the following: insight, persuasion, perception, or investigation.

You may take the help action as a bonus action and if the creature being helped is your twin, they add a d4 to your abilities checks and attack roll. Can be used equal to proficiency bonus and you regain uses after a long rest

You can see and hear what your twin sees, even over other planes of existence, by closing your mind.

If your twin uses the help action within 10 ft of you, make a melee attack as a reaction. You may do this up to your proficiency bonus and refresh on a long rest 

You can speak common and one other language