Your Dexterity score increases by 2 and your Strength score increases by 1. 

Your creature type is undead instead of humanoid.

Your undead flesh makes you more resilient than the living. You gain the following benefits. 

• You are immune to poison damage and the poison condition.
• You are immune to disease.
• You don't need to eat, drink, or breathe.
• You don't need to sleep, you don't suffer exhaustion due to a lack of rest, and magic can't put you to sleep.

When you take a long rest, you must spend at least 6 hours in an inactive, motionless state. In this state you can see and hear as normal.

You have superior vision in dark and dim conditions. 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 color in darkness, only shades of gray.

Any creature that starts its turn within 5 feet of the ghast must succeed on a DC 10 Constitution saving throw or be poisoned until the start of its next turn. On a successful saving throw, the creature is immune to the ghast's Stench for 24 hours.

The ghast and any ghouls within 30 feet of it have advantage on saving throws against effects that turn undead.

Your fangs and claws are natural weapons with which you are proficient and you can use them to make unarmed strikes. They deal 1d6+ your Strength modifier in piercing damage for your fangs and slashing damage for your claws instead of the normal bludgeoning damage for unarmed strikes. 

When you hit a creature with your claws, you can force the target to make a Constitution saving throw (DC=8+ Strength modifier+ proficiency bonus) or be paralyzed until the end of your next turn. Once you use this feature you can't use it again until you finish a long rest.

You can speak, read, and write Common.