Solution to M: Act 0 Meta
We take the answers to the 3 puzzles in the act, we take out the rye and then rearrange the letters to make new words:
1. FIREMAN - remove the R to become FAMINE
2. AWRY - remove the Y to become WAR
3. HEATED - remove the E to become DEATH
This hints at the Biblical Four Horsemen of the Apocalypse. The answer is the one missing horseman, Pestilence.
PESTILENCE