One of the new additions to Warmachine/Hordes in MkIV is Defenses. They’re new terrain pieces that players can add to the battlefield to help give them an advantage against their opponents. We get a look at how they work in this article.
From the article:
We will be adding an exciting new element to WARMACHINE MKIV in coming months: Defenses. Defenses are a new type of terrain feature that players take turns placing on the table after all standard terrain and terrain mandated by the scenario being used have been placed. Each player will have the option to place up to three Defenses for the first player and up to four for the second player. A player places their Defenses on their side of the table.
Our initial offering of Scenario Defenses includes Fire Pits, Powder Kegs, Wall Barriers, and Spike Traps. Fire Pits represent burning hazards on the tabletop that remove Stealth from models in their close proximity; Powder Kegs are explosive obstacles that must be tread around carefully; Wall Barriers are obstacles designed to slow extra-large and smaller based models; and a Spike Trap is an obstacle that damages enemy models moving in its close proximity. All obstacles are removed from the table if they are contacted by an extra-large or huge-based model.
Defenses will be added to the game once they are released in the next few months.
Here are the full rules for Defenses: