Mythic mode is the highest level of raid difficulty introduced with the Warlords of Draenor expansion. The level of challenge is designed to be similar to the old Heroic mode of patch 5.4 with subsequent difficulty level labels now using the name of the harder on the ladder. In Legion, most Broken Isles dungeons will also have a Mythic mode, but it operates differently from the raid difficulty. Currently Mythic raids have a 20-player fixed group size.