Your undead hunger presses you fourth to continue fighting, reguardless of how strong or weak you are. As an action, you may make an unarmed melee attack on something/someone within 5 feet of you using your Constitution modifier. On a hit, you deal bludgeoning damage equal to 1d6+1.

Your body is either withered or rotted. Your mind may have actually decayed, or simply become clouded if you are a fresher corpse.

Your rotting face does not make you one for looks... or words. You have disadvantage on all charisma checks, but advantage and expertise on intimidation and similar checks - at the Game Master's discretion - when you use your frightening visage to scare others.

You should no longer be standing... It is through either magical means, or some apocalyptic disease that your body is able to function. As such you are immune to poison.

You understand the languages you knew in life, but cannot speak; Either your mind is too addled, or your vocal cords and mouth no longer work properly. You may be capable of casting the verbal components of some spells at the Game Master's discretion by groaning, or by echoing some unknowable undead language. However, you must otherwise find a new method to complete the verbal component of spells.

Your condition has afflicted you with a taste for the living. Only living or freshly killed flesh will sate you. Your character can drink and eat other foods, but only living flesh can sustain your vile false lifeforce. Failing to do so will hurt your character. In order to hunt your meals your eyes have become super focused on creatures, granting you Darkvision of up to 60 ft.

The magic or apocalyptic disease that keeps your vile body running forces you to push through deadly damage. If damage reduces you to 0 hit points, you must make a Constitution saving throw with a DC of 5+the damage taken, unless the damage is radiant or from a critical hit. On a success, you drop to 1 hit point instead.