Homebrew Cursed Souls [Undead] Species Details

If creatures die with the curse of "No Soul-Peace", they turn after death into so-called "Cursed Souls".
Cursed Souls are different from regular ghosts in some ways.

 

Appearance and Abilities

Their abilities depend on what they did before death.
If they used to be workers or fighters, they can still interact with weapons or working tools.
If they used to be some kind of mage they can still use some spells from their pasts.

On their neck is a mark. The mark is a symbol of the curse. The way the mark looks can change from soul.
The color of the spirit depends on what they did in their life, the color represents their use to be class. 

Other Information

Cursed Souls aren't bound to anything. They are literally cursed to watch the living.
They can't be seen or heard by normal mortals. But depending on what they use to be, they can interact with objects or creatures.

If they made a deal to a devil about selling their soul, in the days they lived, this deal will be destroyed as soon the curse is cast on them. 
Cursed Souls can't be taken by devils or make new deals with them. They can't be bonded to anything, and especially contracts.

The only way to hurt Cursed Souls is by magic spells. They can't be defeated, but if they lose all health points they faint and are unconscious for 24 hours.

Cursed Souls [Undead] Traits

It's kind of hard to say the traits of Cursed Souls but these are the ones:

Damage Resistance

Every kind of pysical damage attacks

Condition Immunities

 Grappled, Paralyzed,Poisoned, Prone, Restrained

Senses

Darkvision 60 ft.

Ability Score Increase

Your ability scores each increase by 1.

Size

High of human. So around medium

Speed

Your base flying speed is 30.

Languages

You can speak, read, and write Common and one extra language of your choice. In their past they typically learn the languages of other peoples they deal with, including obscure dialects. They are fond of sprinkling their speech with words borrowed from other tongues: Orc curses, Elvish musical expressions, Dwarvish military phrases, and so on.