Your base walking speed is 30 feet.

When you determine your ability scores, increase your dexterity score by 2, and increase your wisdom score by 1. These increases can’t raise a score above 20. You follow this rule regardless of the method you use to determine the scores, such as rolling or point buy.

Your character can speak, read, and write Common Abyssal, as well as one other language that you and your DM agree is appropriate for the character. The Player’s Handbook offers a list of widespread languages to choose from. The DM is free to add or remove languages from that list for a particular campaign. 

Every creature in D&D, including every player character, has a special tag in the rules that identifies the type of creature they are. Most player characters are of the Humanoid type. A race option presented here tells you what your character’s creature type is.

Your creature type is both Humanoid and Undead.

If an effect works on at least one of a creature’s types, that effect can work on that creature. For example, if you are both a Humanoid and an Undead, cure wounds works on you, since the spell works on a Humanoid.

Your size is Medium.

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.

If damage reduces you to 0 hit points, you must make a Constitution saving throw with a DC of 5 + (damage taken), unless the damage is radiant or from a critical hit. On a success, you drop to 1 hit point instead and you can not use this feature again on a success until you finish a long rest.

You are resistant to poison and cold damage, your also immune to exhaustion disease and have advantage on saves vs being poisoned. You don't require air, food, drink, or sleep and can not be magically put to sleep.