Plaguefall

Plaguefall is a dungeon in Shadowlands located in Maldraxxus.

Adventure Guide
''Underneath the ruined House of Plagues, lies one of the most destructive forces Maldraxxus has ever known. Those who covet this power search the plague-ridden debris in a race to claim this weapon for themselves. Whoever captures this prize will hold the fate of the Shadowlands in their clutches.''

Triva

 * One of the concepts for a mount was "Gooey Slimesaber" – From the slime pools of Plaguefall emerged all manner of jellied creature, including this sticky kitty. A slimy saber cat that’s dripping with ooze, it’s the kind of mount that you’re going to want to wear gloves for.