Tainted one

From WoWWiki

Tainted ones are worgen with exceptionally vicious claws and improved combat abilities. They look almost identical to standard worgen, except that they are perhaps a bit taller while standing erect. An opponent typically doesn't know he's facing a tainted one instead of a regular worgen until his foe howls.^[1] They stand almost 7 feet high and weigh up to 300 pounds.^[1]

Known tainted ones

•  Nightbane Tainted One

Possible tainted ones

•  The Big Bad Wolf

References