-227, 80, 714, due west of Costen, and due South from the Far Mines entrance.
Corrupt Rift is home to the Corrupt Knight and Astral Being in its mini dungeon. Clearing the dungeon repeatedly will net you the Corrupt Fragments needed for strong equipment, especially for melee and magic.
Notable NPCs
Costen Guard
-218 81 713 Initially blocks entry into the Corrupt Rift mini-dungeon until the player has completed their quest. Afterwards, will sell you equipment for Corrupt Fragments.