Demonic Slaughter

 is a Demonic Heroic Encounter that can appear in Stronghold, Dread Ring, Icewind Pass, Dwarven Valley, or Well of Dragons. The difficulty and rewards scale with number of participants. 1 or 2 players is Bronze, 3 to 5 players is silver, and 6+ players is gold. If 9 or more players participate, a Demonic Overload Heroic Encounter will spawn after completion of the  Heroic Encounter.

Steps

 * Defeat All Incoming Demons

Encounter
To complete this encounter 8 waves of demon must be defeated within the time limit. After defeating a wave of demons a new wave will spawn in a few seconds.

Rewards
Bronze: 3, 18 , 3 Silver: 6, 36 , 6 Gold: 10, 50 , 9

Chance of:
 * Underdark Ring (,, or )