March of the Immortals (Epic)

When you rally your troops, they fight on long beyond their time to die.

The Gates of Hell (Dice Freaks)

Grimoire of Cosmic Entities Volume One By Eli Atkinson, William Church and Serge W. Desir, Jr.

Original Concept by Serge W. Desir, Jr.

Full netbook can be found on the following website

Dicefreaks d20 Community

Prerequisites: Rally of Renown, Knowledge (history) 30 ranks, infernal rally class ability.

Benefit: Allies under the effects of your infernal rally gain the benefits of the Diehard feat for so long as the rally lasts, and do not die until they have negative hit points equal to your 10 + your class level (thus a contingent of troops under the command of a 15th level dark marshal would not die until they reached -25 hit points).