This is an old mod, but now it has its own thread. Previously (and still), the mod was hidden in someone else's thread on the last page.
The NecroButton2 mod, which only appeared with Dark Energy on Necromancer heroes, has been removed. Dark Energy appears in many places, and the button appears with it, but it is inactive and only bothers the eye; there is no point in assigning a table to it.
Instructions for setting up a hotkey are also included in the archive.
To enable/disable the undead raising table using the 'F' key, go to: Computer/Local Disk C/Users/username/My Documents/My Games/Heroes of Might and Magic V — Tribes of the East/Profiles/Profile Name/input_a2.cfg. In the input_a2.cfg file, find // adventure and add bind input_necrobutton 'F'