The War of the Djinn challenge is part of the Quest for the Lost Eternia Shards - Part 2: Moraggo Desert Town DLC.
The goal of the challenge is to defeat the Djinn, then quickly rub their lamps to win their allegiance.
Gameplay
Upon killing hostile Djinn, they leave a small trail as they're sucked into one of the many lamps around the map. If that's not enough, you can find an occupied lamp by the noise it makes. The bonging sound gets stronger as you get closer, just like a game of hot & cold. Occupied lamps also jump up and down and emit pinkish (purple?) smoke. A friendly Djinn will spawn when the lamp is rubbed, upgrading your defenses and attacking enemies. Each wave is completed by spawning the required number of friendly Djinn.
Rewards
Genie King's Shardstaff - Apprentice staff of mythical property obtained from completeing the challenge on Insane (including Hardcore).
Shai Hulud - Huntress gun which looks like that of an alien wurm obtained by completing the challenge on Medium (Shoots the same balls Ogres do).
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