Open the teleport panel with ::teles, then the Bosses tab, and take the Corrupted Gauntlet row. It is filed under Raids.
Panel
Bosses - Raids
Requirement
Hunllef
Danger
Safe
Destination
3032, 6127, plane 1
Corrupted Hunllef is marked at 3032, 6127, plane 1.
Drops
Rates are per drop-table roll. A kill rolls the table one to three times, so the real per-kill chance is a little better than shown. Blood money and coins are guaranteed on every kill.