1

You are haunted by a non-hostile Ghost, Imp, Quasit, Fey (etc.) only you can see.
It mocks or disturbs you constantly.
It either cannot be harmed or reappears shortly after death.

2

Every night you dream of the place where you were cursed.
(Possibly mechanically impairing resting ability if unchecked)

3

Food rots in your mouth as you bite and water turns foul....but it's only an Illusion.

4

A light fog gathers around you, and never departs.
(Possible vision impairment)

5

Wherever you go, you hear whispers of those that died there.

6

The night sky is only black to you - no stars, no moon(s)

7

You feel very uncomfortable in direct sunlight.
(Prolonged exposure should cause mechanical impairments)

8

You feel uncomfortably cold no matter the temperature.

9

When the question of a violent or non-violent approach, you struggle to let a chance to draw blood pass.

10

You attract vermin repulsive to you.

11

You begin drifting into a nocturnal sleepcycle. Honestly, the night is much more comfortable...

12

You smell of death to others.

13

You begin to have momentary visions of blood, increasing in frequency, day by day.
Blood on your hands, others suddenly bleeding violently, taste of blood, being sprayed with blood...

(GM: Describe one of these to the affected Players at least once per "normal" interaction/scene. In Combat, everything is super gory to the cursed.)