Massive damage

From NWNWiki

Massive damage is a PnP rule originally included in NWN but was removed when the Hordes of the Underdark expansion introduced epic levels (patch 1.59+). [1] [2]

When a character received 50 points of damage or more, they needed to make a DC 15 fortitude save or die. It was only enabled in hardcore and very difficult difficulty setting (not normal, easy or very easy).