I don't know if this is supposed to happen or if it's a bug or not, but when you revive as Undyne the Undying, you're supposed to be immune until your timer runs out correct? That's why the armor is so strong, so you take no incoming physical damage.


Well when I was fighting Dragonfly and she got enraged/spawned her Lavae, they set me on fire and killed me in my Undying form (which only has 50hp after the temp revive) which wasted my entire timer and 20 days prior to farming up the gauge to 200. There's also a bug where, once your second phase wears off the Determination star has like 99999 on it. This allows you to revive yet again after dying a second time but will simply just kill you because your keybind sees the gauge as full, where as the game knows it's at 0 and still kills you once you transform. It's perfect for exploiting bone shards but rather annoying due to me needing to log out to fix it.