Your evil mentor, Mendechaus (Richard Ridings) has decided to take time out from his conquest of the known world to put you through your paces in the Crucible - a deadly trial concocted somewhere in the Aether, where you must face an endless onslaught of his most monstrous creations - all in the name of his amusement. Death is inevitable, but the question is: how long will you last?

• Six all-new levels designed exclusively for Crucible mode, which will push your skills to the brink
  
• Two unique challenges, varying from the scalding to the incinerating
  
• Leaderboards for each map and challenge combination, so you can see who of all the Underlords is the most long-lived
  
• Three powerful Lifeline abilities, should you enter into dire straits
  
• Three prestigious new Worker skins to unlock should you survive long enough
  
• Dozens of new units and variants including the Democorn, Mandalf the Maroon, and the Chunder King himself, Baron von Pukemuch
  
• Scores of deliciously depraved new voiceover lines from the exceptional Richard Ridings as Mendechaus, your enigmatic mentor and bloodthirsty invigilator

• Gameplay Mutators for Skirmish, Sandbox, and Multiplayer modes
  
• Customise your game mode settings with tons of tweakable options
  
• Define the availability of rooms, units and more through the Unit Spawning and Veins of Evil mutators
  
• Create Mutator Sets for your levels in the Map Editor, to enhance your custom maps
  
• Community translation tools so you can bring War for the Overworld to other Underlords across the Underworld
  
• Many other updates and fixes