Choose one extra race, you were a part of this race before you died. your speed, height and appearance are al based of this race. Special movement (swimming, flying) is not influenced by your former race.

+1 constitution

you are immune to poison and the poisoned conditioned.

Bone Pile.

When you are reduced to 0 hit points but not killed outright, you can drop to 1 hit point instead. If you do, you reduce yourself to a pile of bones, render yourself prone, and are considered to be under a similar effect to the feign death spell. While subject to this condition, you are unable to move or take actions other than using an action to end this effect. You can’t use this feature again until you finish a long rest.

Let me know if you'd like it formatted for D&D Beyond or turned into a printable card for your DM screen setup.

Bone To Pick.

Whenever both of your hands are free (not including equipped shields), you may choose to use a free hand and a bonus action to remove one of your hands or arms. If you remove an arm, it counts as a weapon with the finesse property that deals 1d6 bludgeoning damage, and you have proficiency with your arm while you wield it. If you remove a hand, it counts as thieves’ tools or a similar set of simple tools while you hold it. In either case, removed hands and arms may be re-attached by using another bonus action.

Poison Resilience.

You have advantage on saving throws against poison, and you have resistance against poison damage.

Unnatural Vitality.

When you drop to 0 hit points, you may choose to stay conscious instead of falling unconscious. If you do, you gain temporary hit points equal to your total character level. In this state, you may take an action or bonus action on your turn, but not both, and you make death saving throws at the end of your turn as usual. You can remain in this state until you fail your first death saving throw (at which point you fall unconscious and continue making death saving throws until you stabilize or regain additional hit points) or die outright to massive damage. You can't use this feature again until you finish a long rest.

Dead Immortality.

You do not age. Given time, the necromantic energies that sustain you will heal most wounds you take at approximately the same rate as a mortal, and your hit dice function as normal.

Undead.

Raised from the dead as a being of undeath, you count as an undead creature for all spells and abilities that affect the undead. You are immune to disease and treat exhaustion as if it was one level less. You do not need to eat or breathe, but you can ingest food and drink if you wish. Instead of sleeping, you enter an inactive state for 4 hours each day. You do not dream in this state; you are fully aware of your surroundings and notice approaching enemies and other events as normal.

Darkvision.

Through necromantic energy, 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 grey.