Vampirism (Online)

Vampirism is a disease in The Elder Scrolls Online that has various effects on the character's appearance, resistances and even adds a new skill line. It has four stages of severity, with every stage making the negative effects stronger but also reducing the cost of vampiric abilities. Stage one is the least severe one and four the most severe, respectively. Over time vampirism progresses to higher levels, and feeding on NPCs or players resets vampirism to stage one.

Getting infected
The player can get infected with vampirism by getting attacked by an NPC vampire, or by being fed on by another player who is afflicted with vampirism.

Negative Effects
Every vampire has a 50% weakness to fire damage and regenerates health more slowly than as a humanoid. While the 50% fire weakness is the same at all stages, the health regeneration penalty grows bigger with every stage towards stage four.