The mod is fully playable and stable for the grand campaign. However, the team (now unofficially working on Shogun: Total War related projects) considers it feature-complete. There are no game-breaking bugs. You can complete a full long campaign from 1212 AD to the late 13th century without issues.
Some planned features like full naval battles (Attila’s engine limitations) or certain emergent factions were never fully implemented, but the experience is 95% complete and more polished than many official DLCs.
Papal & Crusade Mechanics
Feudal Recruitment & Unit Progression
Emergent Factions & Late Game Threats
Sieges & Battle Gameplay
Because Medieval Kingdoms 1212 AD is a total conversion, the creators wrote a comprehensive "paper" (manual) to explain the new campaign mechanics (Royal Authority, Recruitment Pools, and Era-specific mechanics). This is the single most useful document for playing the campaign effectively. total war attila mod medieval kingdoms 1212 ad campaign link
Document Title: Medieval Kingdoms 1212 AD Campaign Manual Hosted on: Steam Guides / ModDB Link:
Key Sections covered: