What does darkness and decay and the red death held illimitable dominion over all mean?

Answer:
This means that in the end of Edgar Allan Poe's "The Masque of the Red Death," the red death ends up killing everyone inside the Prince's abbey, which is ironic because the purpose of locking themselves in the abbey in the first place is to escape the red death.
First answer by Briinbriout4. Last edit by Briinbriout4. Contributor trust: 0 [recommend contributor recommended]. Question popularity: 1 [recommend question].