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Arhu's Failed Experiment is a side quest in Divinity: Original Sin.


After accepting The Fabulous Five quest, talk to Arhu about his failed experiment. He'll give you Arhu SparkMaster 5000 Universal Controller and allow you to take Universal Controller Instruction Manual with instructions on how to use the remote.


  1. Go to the cave, mentioned in The Fabulous Five quest. There you will meet three soldiers who will aid you in the fight with the SparkMaster 5000.
  2. You can fight the Arhu SparkMaster 5000 normally or use the remote to your advantage.
    • Use the remote's Weapon Deactivation Mode (Sleepy-Sleepy-Happy) to disable the Sparkmaster's defenses and weaken him.
    • To deactivate it completely instead, use Party Mode (Happy-Happy-Happy) followed by Self Destruct Mode (Angry-Angry-Sleepy) on your next turn. This option will give you no XP.
    • Note: You can only use a combination once. (Update: this may only be true depending on edition/version. The latest GOG D:OS EE version as of 10/8/2018 allows deactivate weapons to work multiple times)
    • Note: The remote control is currently (2017-12-27) bugged and sometimes the only command that works is self-destruct - confirmed by multiple sources. Results may vary.
    • Note: When using the remote, if the character has exactly the amount of AP needed to use it, using it will automatically end the turn, potentially allowing the SparkMaster to use its attack before you disable it.
  3. If any of the soldiers survived the fight, return to Cyseal and go to the prison in the basement of Legionnaire HQ. Talk to Richard and win the RPS game (790 Charisma XP) to gain access to the treasure room.

NOTE: If you did not join the Fabulous Five, it is still possible to receive the quest once you enter the cave, after which the remote control can be retrieved.


  • 1575 XP if you defeat Arhu SparkMaster 5000 without deactivating it
  • 1935 XP for killing skeletons
  • 1800 XP