Doom RPG Mod

Doom RPG Mod (or just Doom RPG) is a gameplay mod created for the GZDoom source port, and first unveiled to the public in August of 2012. It was originally created by Kyle873 in the wake of an absence of in-depth gameplay mods implementing RPG mechanics to the Doom formula. The mod introduces mechanics such as these in the form of leveling up by killing monsters, a currency system through credits dropped by killed foes, a ranking system and mission select screen, as well as various stats and augmentations that can be modified. Also included with the mod is UAC Outpost, a map that may be accessed which contains a shop, an arena and multiple other facilities to utilize and flesh out the mod's many features. The project has seen different forks and owners over the years, as once Kyle873 stopped updating it, development was picked up by Sumwunn who rebranded it as Doom RPG SE. Eventually, lucker42 became the maintainer with the mod now under the moniker of DoomRPG Rebalance.

One core component of Doom RPG is its cross-compatibility with several other gameplay mods. The mod has since its early days had a close relationship with Doom Roguelike Arsenal by Yholl, and both mods were given a honorable mention at the 2014 Cacowards for their intricacy when played together.

Content
As befitting its name, Doom RPG introduces many Role-Playing Game elements to Doom, and attempts to merge them naturally with the flow of the original game. By itself, the mod contains several new items, features and boss monsters, but the vast majority of its featureset involves the RPG elements themselves and their customization.

RPG mechanics
The key features of Doom RPG are the inclusion of a leveling up and stat systems, allowing players to customize the properties of their characters to favor a specific playstyle. There is also a currency system, involving credits, which are dropped by killed monsters. To top these off there is also a rank system with payouts in credits and purchase discounts, a skill system offering many different perks such as Healing, Support, Powerups, Auras, Attacks, Summons, Utility and others, an augmentation system usable through items, and finally, an in-game shop offering weapons, ammo and supplies.

There are also several more minor elements that nonetheless can change the game drastically, such as all-new inventory items and new boss enemies, an in-game menu that helps keep track of the various abilities and options, and various message and HUD improvements to better communicate the in-game events. Finally, another important aspect is the configurability of the mod, because nearly every aspect of it may be finetuned to the player's liking via a series of custom options menus.

UAC Outpost
See main article: UAC Outpost.

Doom RPG comes with one extra map, called UAC Outpost. This map can be reached at any time using the Transport skill, and features a shop to purchase supplies, an advisor where you can select mission objectives to fulfill during your playthrough (pending rewards), and also a series of combat arenas with enemy waves where you can level up, gain bonuses and test your unique skills and abilities.

Mod compatibility
By default, Doom RPG is built in order to maintain a high compatibility level with several other mods. The one most often paired with it is Doom Roguelike Arsenal, which is even offered in the official github download, but compatibility patches also exist for a number of other mods, including Corruption Cards, Colorful Hell, WadSmoosh and several others.