A fan-produced mod that RWS included in its Fudge Pack compilation. Using the basic Postal 2 engine and elements, the game features completely new maps and a horror-based storyline that puts the player into the role of an escapee from a mental asylum similar to Manhunt 2. The zombies from Apocalypse Weekend play a major role in this modification, including a brand-new zombie (exclusive to Eternal Damnation) that resembles the plastinates of Body Worlds.
Take Manhunt > remove stealth mechanics > put it in first person > give it a scary, Silent Hill-esque atmosphere.
That pretty much sums up Eternal Damnation. Awesome mod, a must have for anyone who owns Postal 2!
This will work with the Steam version, by the way. First, install Share the Pain MP (it can be downloaded from Mod DB). By default, it will want to install to C:/Program Files (x86)/Postal2STP. Install it there, rather than in the Postal 2 folder. Then, download and install Eternal Damnation to the same folder. It will ask if you want to create a desktop shortcut: say yes.
Optional: when finished, open Steam and select "Games" in the top left corner, then click "Add a non-Steam game to my library. Select "Browse," then select the shortcut. Under your game library, you'll find ED and can launch the game from there.