Today, Pagan Online, an action RPG inspired by Slavic myths, has received its long-awaited co-op update. The title, developed in collaboration between Mad Head Games and Wargaming, entered early access in mid-April without multiplayer due to technical issues. Now you can play side missions or assassinations (not the main campaign, though) in two-player co-op. With the next patches, the developers promise to roll out four-player co-op along with synergy effects between heroes, special systems for co-op only, special rewards and drops, as well as…