Greater Diehard (3.5e Feat)
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Greater Diehard [General]
You refuse to die.
Benefit: Add the negative value of your total HD to the HP value at which you die. For example, a 9th level character would not die at -10 hp, but they'd die at -19 hp. Also, add the negative value of all hit points granted by Toughness and Improved Toughness to this amount (if you have those feats).