Argus is a unique monster located in the Labyrinth. He is located in a random zone in a manner consistent with the Labyrinth's daily layout, but will only spawn in the Merciless and Endgame Labyrinths.
Argus will always drop a Treasure KeyTreasure KeyThis item is required to open one of Izaro's Treasure Chests located in the Labyrinth. This item will drop on the ground when leaving the Labyrinth. when killed. He is also immune to the Labyrinth's traps.