Users become stronger, faster, more durable, etc. when they convert others, possibly unlocking abilities related to the affinity and enhancing the existing powers. Some users may be able draw sustenance from their affinity or even slow or stop aging.
- Decelerated Aging/Semi-Immortality
- Enhanced Condition or Supernatural Condition
- Self-Power Augmentation
- Vampires (Folklore); sometimes
- Agent Smith (The Matrix)