Your type is Fiend.

Your Charisma score increases by 2, your constitution by 1.

You have a walking speed of 30ft.

You count as a Tiefling for the purposes of qualifying for Tiefling Racial Feats.

You have advantage on saving throws against spells and other magical effects.

You may communicate telepathically with a creature you can see within 60ft of you, and they speak telepathically to you in return. You must share a language with the creature you are attempting to communicate with.

You can speak, read, and write in Common. You also gain an additional language based on your subrace: Infernal for Devils

Not worth a Yugoloth: 
Yugoloth planning and deceptions are so well known and ingrained into their being that their entire society’s motto explained how utterly pervasive was; if you weren’t able to use your wits, you weren’t a yugoloth to them.
As a bonus action, you may attempt to deceive a creature that can see or hear you, within 120ft by making a Deception check against the creature’s insight check. On a success you can gain advantage on one attack of your choice against that target, before you finish a long rest. This attack deals an additional 2d6 damage.
You may use this feature a number of time equal to your proficency bonus, and regain all expended uses once you finish a long rest.

Fiendish Inheritance: 
At Fifth level, you gain proficiency in the Deception and Intimidation skills, if you already have proficiency in either of said skills you may instead choose a skill in which you’ve got no proficiency on.