rdfs:comment
| - Once in this dimension, they cannot be killed. However, they can be blocked by material barriers. The older the barriers, the more effective they are, but even the oldest of barriers cannot stop them forever. Paradoxes can also allow them to directly materialize at the spot of the paradox. If the timeline is restored, they vanish, with their actions reversed as if they had never happened.
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abstract
| - Once in this dimension, they cannot be killed. However, they can be blocked by material barriers. The older the barriers, the more effective they are, but even the oldest of barriers cannot stop them forever. Paradoxes can also allow them to directly materialize at the spot of the paradox. If the timeline is restored, they vanish, with their actions reversed as if they had never happened. In "Father's Day", the Doctor explained that when the Time Lords were still around, there were laws to prevent the spread of paradoxes and that such paradoxes could be repaired. This implies that the Reapers are a natural phenomenon whose manifestation could be prevented if the paradox was resolved quickly. However, with the elimination of the other Time Lords in the Time War, there was no longer any agency that could repair time.
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