Seems like this could be pretty good for Demon looking to survive a Wail,
Grunker:
View attachment 32086
Though I've been told that there's only one way to beat that fight.
No, for quite obvious reasons. You can’t activate Demonic Rage until your first turn of combat, so by then you’re already dead. It’s not like normal rage that can be toggled outside of combat.
Besides that, Wail is not the primary issue. Wail is ”only” DC 49 and can be survived with Last Stand. As I’ve already stated many times, while this is still a uniquely specific requirement unlike any other fight, it’s still less of a burden on your builds.
Now tell me how to survive Seductive Presence without being minmaxed for the save and provide example fights with a similar requirement.
Though I've been told that there's only one way to beat that fight.
Should probably save the gloating for relevant, let alone correct, info. Even if the amulet worked like you thought it did, you wouldn’t survive the fight with it.