Question: which third annual Arrowverse crossover event did "Medusa"  features 
Sentence (from "Death of X"): "Death of X" is part of a series of story arcs that have impacted the Inhumans and X-Men titles after Secret Wars ended and Earth 616 was restored along with being related to the events of the Infinity, Inhumanity, and Inhuman story arcs.
Relevant evidence: No