Fight a Sewer Wererat is the fifth mission unlocked in the Fledgling tier of missions at level 2.

It requires two Energy, as well as five Vampiric Claws and ten Fangs Ability. On completion, it provides 520 to 780 blood, three experience points and provides a rare ability, Command Rat Swarm

With the May 8, 2009 update it also provides 10% mission mastery.