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.

Fleeting Memories- You still have fleeting memories of your past life, retaining specific skills, traits, and/or abilities from it. You gain one feat.

You are immune to poison damage and exhaustion, and you can't be poisoned. You don't require air, food, drink, or sleep. In addition you count as undead in terms of spell effects.

Driver of the Dead.

You appear to be undead to other undead, and they will not attack you unless provoked by you or commanded to. In addition, you can attempt to guide the horde with a charisma check against a DC 10 wisdom save if they are not controlled. If they are controlled, it's against their controller's spell save DC. If you succeed, then you can change the current course of the horde.

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 can't speak, but you can understand, and possibly read and write in (only if your intelligence is 5 or higher), the languages you knew in life.