Shadowflame Corruption (5e Disease)
From D&D Wiki
Contracting Shadowflame Corruption
The disease can be obtained by coming in contact with a shadow flame gem.
Stage 1: Those who get the disease become immune to necrotic damage, change their alignment to Lawful Evil OR Lawful Good, and learn the ´Shadowflame Hex Spell´ action. They also turn a slight shade of purple.
Stage 2 After 3d20 Hours every 1d20 Hours Roll CON DC 15 if failure they turn a Dark Shade of Purple deal 1d10 Radiant Damage Or if sunlight its 2d20 times by 2. Every Hour for 1d8 Hours. Repeat every 1d4 Days.
Endgame After 4d8 Days the roll is now every 1d20 Times by 2 days. If they chose Lawful Evil they Learn Chill Touch being able to cast it 1d4 Turns. If they chose Lawful Good they get Spare the Dying being able to be casted every 1d4 Turns
Shadowflame Corruption can be cured by smashing a shadow flame gem(obtained by either killing another sick patient or taking one that has fallen from the sky) and sprinkling the powder on them. Or Find an Alter in The Underdark that cures this at the cost of 1d100 (divided by 2 if over 50) Gp Worth in Gems.