Your higher tolerance for pain has some benefits. Your Constitution score and Strength score both increase by 1.

You already died once. Now, your body is only sustained your will to keep going... and the brains you feed it. Without proper sustenance, a zombie's flesh will fall from their bones within a few months.

You roughly retain the shape and size of your former self. (If you want to make a Small or Large zombie, be my guest)

Your base walking speed is 30 feet.

Undead no longer need to eat normal food, drink, breath, or sleep. Instead of sleeping during a long rest, they must enter in to a state of semi consciousness, for 4 hours a day. You do not dream in this state. While remaining in this state are aware to your surroundings, but you have disadvantage on perception checks. After resting in this way you gain the benefit that a living creature does from 8 hours of sleep.

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.

You are dead, and no matter how much you may try to hide it, others can always tell there's just something... off, about you. Especially once they get a glance of your rotting body. You get disadvantage on Persuasion checks, and gain proficiency in the Intimidation skill.

When you are reduced to 0 hit points but not killed outright, you can drop to 1 hit point instead. You can’t use this feature again until you finish a long rest.

Due to your unholy persistence to exist after death, you have a resistance to poison damage, but are vulnerable to radiant damage.

You're not like normal zombies, which crawl around mindlessly, fighting whatever comes in their path. You have a will, a mind of your own. But this comes with a price: A brain for a brain...

Every 48 hours, you must consume the brains of a humanoid creature. Whenever you fail to do so, you gain one level of exhaustion, as per the normal exhaustion table, except level 6 leaves you a brainless, ordinary zombie, a death of the self. Eating one full brain heals one level of exhaustion immediately.

As an Undead creature, most healing spells don't have an effect on you. Luckily, you can supplement your healing by eating some cerebral matter. You can harvest the brains of a freshly slain humanoid and keep them with you for a week. When you eat a quarter of it, as an action, it heals 1d4 hit points plus your Constitution modifier.

You speak Common and one other language of your choice, usually either one you knew before death, or one your creator would've spoken.