When the buff is transferred, it will last for 30 seconds. These buffs can be transferred to the player if the Supreme Monster is defeated. These monsters will possess an attack-type buff from the elixirs that can be made from the Darkness Souls found in Gate of Darkness.
In Heroic Mode, there will be additional monsters known as Supreme Monsters, which are stronger than normal Heroic monsters. They will have increased offensive and defensive stats and will attack with increased speed. In Heroic Mode, all monsters and bosses will be stronger than their normal dungeon counterparts. Unlike the normal buff, the Heroes Assemble buff will be weaker in Heroic Mode dungeons. Similar to regular dungeons, players will receive the Heroes Assemble buff when entering dungeons on Heroic Mode through the queue system, which will increase stats in proportion with the number of players in the party. Mobs and bosses of the dungeons are the same as in their normal counterparts, but significantly buffed, including Absolute Monsters which have even stronger buffs and abilities.
Unlike normal dungeons, stamina is not consumed while playing, and you are limited to only 3 resurrections.
Upon entering Heroic Mode, you and your party will be placed in a random dungeon (Velder ~ Elysion, excluding Secret Dungeons). Heroic Mode is a mode where high level players can play significantly more challenging versions of normal dungeons, and acquire rare items and powerful equipment.