The user can drink blood to amplify their abilities or to heal their wounds more quickly.

The user has a wolf form with an independent health bar. If their wolf form drops to zero hitpoints or becomes unconscious, they revert to their normal form in the condition they were before they shifted into a wolf.

If the user becomes unconscious, instead of dying they remain unconscious for 1d4 days. After this, they will be regenerate to full health.

You give a player or non-player character of your choice your blood. They make a constitution saving throw with advantage. If they succeed, they don't become a vampire and experience flu-like symptoms for a week. If they fail, they are turned into a vampire.