Delirium monsters invulnerable

I love the game, have been playing non stop, thanks.

I'm not sure this is a bug or design decision, but delirium monsters are invulnerable to close to 2 seconds before you can hit them. I think it is completely unfair to be pushed around by invulnerable monsters, and I have more than a dozen deaths due to this. I have been saving simulacrum stones for now since this gets to absurd levels during the event.

Thanks again for the amazing game, best.