There are things out there that won't let you die. Forces inside of you can affect your actions and your person, not allowing you to die. This is both a blessing and a curse... mostly curse.
After taking damage from at least one source equal to or greater than your Constitution score during the previous round of combat, or under other suitably stressful conditions, you will make a Possession check at the beginning of your turn.
Your Possession check die begins as a d10. When you roll a 1 on the d10, roll for an effect on the table below. Additionally, after this, your die changes to a d6. When you roll a 6 on the d6, your Possession die increases back to a d10. When you roll a 1 on the d6, roll for an effect on the table below. Additionally, after this, your die changes to a d4. When you roll a 4 on the d4, your Possession die increases back to a d6. When you roll a 1 on the d4, you are possessed.
While possessed, the forces inside you must be forced back down. This is achieved through three successful Wisdom saving throws, one taken at the end of each of your turns occurring after possession.
While still making these Possession saving throws, you are stunned. Damage taken during the previous round of combat gives you disadvantage if the amount taken from one source is equal to or greater than your Constitution score. These saving throws are receptive to the Help action and any additional modifiers or aids.
Possession save DC = 8 + your Charisma modifier
If you reach three successful Possession saves before three failed Possession saves, you are unpossessed, you are no longer stunned, and your Possession check die resets to a d10.
If you reach three unsuccessful Possession saves before you reach three successful Possession saves, you are fully possessed, you are no longer stunned, and your alignment changes to evil. You may continue to make Wisdom saving throws with the DC now equal to your spell save DC, and you are unpossessed when you reach a total of three successful saves (including any successful saves made before full possession).
| d4 | Possession Check Effects |
|---|---|
| 1 | A blood cobra erupts from your most recent wound (or your mouth if you are uninjured). This cobra has the stats of a Giant Poisonous Snake and makes attacks against the closest creature. If there is no one within 10 feet of you, it makes attacks against you. Attacks continue until it is killed, it is dispelled, or until you regain all hit points. |
| 2 | You emit a blast of infernal energy. You and each creature within a 10-ft radius of you must make a Dexterity saving throw against your Possession save DC or take 5d6 necrotic damage. On a successful save, they take half damage. |
| 3 | All effects on the Physical Changes table happen at once and last for a number of hours equal to half (rounded down) the triggering damage (or half your Constitution score rounded down if damage was not the trigger). |
| 4 | You briefly transport yourself and the creature that triggered the Possession check to hell. If no one creature holds responsibility, either multiple are affected or you alone are affected. All affected creatures must succeed on Wisdom saving throws against your Possession save DC or take 4d8 psychic damage. Devils and demons are resistant to this damage effect. Both you and the other creature reappear instantly, and this effect happens entirely within your turn. |
When you are reduced to 0 hit points but not killed outright, make a Constitution saving throw. On a 6-20, you drop to 1 hit point instead. When this happens, the forces inside of you temporarily take over. As a result, for the next 1d6 days, you have disadvantage on Possession checks (but not saves) and a physical change that you can pick or roll for on the table below.
| d6 | Physical Change |
|---|---|
| 1 | Your eyes turn pure pitch black, and black veins spread out from them across your face. |
| 2 | Your hair transforms into intangible shadowy red-black snakes. |
| 3 | The dorsal side of your body appears to be drifting off into black shadow and mist. |
| 4 | Intangible hands made of shadow cling to your body, and your skin has necrotic patches where the hands cling. |
| 5 | Your voice becomes no more than a raspy croak, and wisps of dark smoke are emitted from your mouth when you speak. |
| 6 | You appear to age by half of your race's average life span. |
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