You can find The Underbog dungeon within Zangarmarsh, Outland.
The coordinates are (50.1,40.5)
/i Mushrooms spawn in random locations & explode after 20 sec. Spore Cloud covers an area dealing nauture damage. When boss at 20% Foul Spores steals health from all nearby players.
/i Breathes acid on all players in front of him dealing nature damage. Tail Sweep hits any players standing behind him & knocks back. Spits acid at a player, does nature damage.
3. Swamplord Musel’ek
/i Knocks players back. Multi-Shot fires arrows at players & can hit up to 3 allies. His pet Claw will inflict physical damage & Echoing Roar will reduce nearby players armor by 50%.
4. The Black Stalker
/i Boss will Levitate a player in the air. Static Charge inflicts ticking nature damage. Uses Chain Lightning.
Heroic Differences: Spore Strider summons adds to attack you.