nullifier
Noun
Meaning
One who nullifies or makes void; one who maintains the right to nullify a contract by one of the parties.
Source: Webster's dictionarySynonyms
voider
invalidator
destroyer
medicine
amateur
cure
remedy
preventive
corrective
antidote
antacid
annihilator
defecator
antitoxin
countermeasure
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Antonyms
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Examples
my bank check was voided and I wanted to know who the invalidator was
Doctor Doom and Alpha-Reed Richards tried to stop them although Alpha-Reed Richards was killed using the Ultimate Nullifier while Doctor Doom was apparently killed by the Mad Celestials.
Knowing that the Fantastic Four would use it against him, he spares the Earth and reclaims the Ultimate Nullifier.