Prescient Dreams allows your mind to glimpse fragments of potential future events in your dreams once per long rest. These visions are incomplete until the actual events you glimpsed begin to unfold and may be unreliable so that the events do not unfold exactly as foreseen. The content and the reliability of the dream will be determined by the DM.
When the events related to the event unfold, the vision grants you a +2 temporary bonus that you can apply at any time to either an initiative roll, an attack roll, a damage roll, a saving throw, or a skill check throughout the duration of the event - if you are acting with information imparted by the dream that is determined to be reliable. Any action taken with information imparted by the dream that is determined to be not reliable, will result in a -2 added to the action.
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