: Known as "M-Day," this reality-altering act reduced the mutant population from millions to fewer than 200, an group often referred to as "The 198".
Many mutants died instantly if their powers were active (e.g., flying or living in extreme environments). Decimation - X-Men - Son Of M (2006) (Digital) ...
The U.S. government initiated , using piloted Sentinels to "protect" and effectively house-arrest the remaining mutants at the Xavier Institute. Son of M (2006) Series Summary : Known as "M-Day," this reality-altering act reduced