Heroic Dungeons are special, limited-time dungeons that allow players to earn exclusive rewards, most notably, Warmasters.
Each Warmaster Dungeon has 6 floors, the completion of all floors awards enough cells to rank the Warmaster to level 5.
Players may only use monsters that share an element with the Warmaster throughout the floors. On Floor 2, players may only use monsters that have been ranked to at least Rank 1, with each subsequent floor requiring the next rank at minimum. With Warmaster Ragnarok's Dungeon, the elemental restrictions on each floor are as follows, in order: nature, earth, thunder, fire, metal, and magic.
Each battle also has a Battle Condition. These may be positive ("all monsters begin with evasion") or negative ("all monsters begin stunned") and are listed below.
Unlike Resource Dungeons which utilize , Heroic Dungeons utilize the special resource . These may be earned in Timed Challenges, Daily Missions, Multiplayer season rewards, or purchased for .
Heroic Dungeons typically last for 7 days, Saturday through Friday, after which they are replaced by another set of Heroic Dungeons. Any progress made in a Heroic Dungeon is saved when that Dungeon repeats.