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Onslaught Harbor is the base of operations for the Scarlet Onslaught in Icecrown within Northrend. It is located just off the western coast of the large glacier. The harbor itself is built on a small island. A bridge connects the harbor to a larger island, upon which sits the Crimson Cathedral, in which the recently resurrected Archbishop Landgren resides, surrounded by Onslaught Raven Bishops.

Red lightning can be seen from time to time on this island, and contributes to the Scarlet Onslaught's hatred effect towards the Scourge.

Behind the cathedral and harbor is a heavily guarded cave known as the Hidden Hollow, in which Barean Westwind, leader of the Onslaught resides.

v • d • e Subzones of Icecrown Aldur'thar: The Desolation Gate · The Argent Vanguard · Argent Tournament Grounds (Argent Pavilion · The Argent Valiants' Ring · The Aspirants' Ring · The Alliance Valiants' Ring · The Horde Valiants' Ring · The Ring of Champions · Silver Covenant Pavilion · Sunreaver Pavilion) · Balargarde Fortress · Battlescar Spire · Blackwatch · The Bombardment · The Breach · The Broken Front · Cathedral of Darkness · The Conflagration · Corp'rethar: The Horror Gate · The Court of Bones · The Crimson Cathedral · The Crimson Dawn · Crusaders' Pinnacle · Death's Rise · Deathspeaker's Watch · First Legion Forward Camp · The Fleshwerks · Halls of the Ancestors · The Hidden Hollow · Icecrown Citadel (The Frozen Halls) · Icecrown Glacier · Ironwall Dam · Ironwall Rampart · Jotunheim · Kul'galar Keep · Malykriss: The Vile Hold · Mord'rethar: The Death Gate · Naz'anak: The Forgotten Depths · Njorndar Village · Onslaught Harbor · The Pit of Fiends · Quel'Delar's Rest · Rise of Suffering · Sanctum of Reanimation · Saronite Mines · Savage Ledge · Scourgeholme · The Shadow Vault · Silent Vigil · Sindragosa's Fall · The Silver Blade · Ufrang's Hall · The Underhalls (The Circle of Suffering · Hall of Horrors) · Valhalas · Valley of Echoes · The Valley of Fallen Heroes · The Valley of Lost Hope · Weeping Quarry · Ymirheim Icecrown category