Annihilus in Diablo 4 Season 15 is a Unique Horadric Seal, and its reported drop path is the rare Echo of Uber Diablo that may appear after a World Boss. It is not a Charm or a Reliquary reward, and defeating a World Boss does not guarantee the Echo. For general gearing outside this hunt, some players choose D4 Gold as a separate option, but that does not establish or trigger the reported Echo...