Nullifiers [noun]
Definition of Nullifiers:
counteracting agent
Sentence/Example of Nullifiers:
I knew that I was the son of a nullifier, and the nephew of a Union man.
Without Mercia's nullifier, the stars were not visible to ordinary eyes, since the light-rays would take years to reach the Earth.
Saturn reported no evidence of the phenomena, because of the interfering rings and the lack of Mercia's nullifier.
That which the great Nullifier hesitated to counsel, his disciples and successors dared to do.