DEATH is ETRO
If the summons of each nation (Ifrit, Fenrir, Bahamut, Leviathan) in FFXV are referred to as a 'god', then that would make absolute sense.
Since the games in the Fabulla Nova Crystallis have the same mythos, then Etro, in FFXV, is also represented as the god (or in her case, goddess) of death and chaos.