Help me come up with stats for this magical artifact my players grabbed! I wanted a cursed item with both upsides and downsides. It was pulled off of an extra-planar nightmare-dragon who hates gods and enjoys devouring souls.
Nightmare Wing Cloak (1 weight)
Torn from the flesh of the fallen nightmare lord, Ror’gosh, this sinewy black cape immediately bonds itself to the wearers neck once fastened.