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awakened weapon and a eudemon. Put them in the magic cube, the weapon in the sun slot and the eudemon in the moon slot. Now, your eudemon is attached to your weapon. When the weapon is equipped, you should see a picture of your eudemon in the bottom left corner. Click on it. It will give you a window where you can view your eudemon. At the bottom of said window, there should be buttons that say "activate" and "release". These are actions you can take with your eudemon. Until you activate your eudemon, it isn't doing ANYTHING helpful.