Avowed: A Single-Player Fantasy Adventure
While Avowed has been compared to Skyrim, its gameplay is more akin to Obsidian's The Outer Worlds—a single-player experience. This means there's no multiplayer functionality whatsoever. Forget co-op adventures or player-versus-player combat; you'll be facing AI-controlled enemies and companions throughout your journey. No invasions or online interactions are present.
Initially, Obsidian Entertainment did intend to include co-op features, even using it as a selling point for investors. However, this aspect was cut during development due to the team's focus shifting. While a co-op mod for the PC version remains a possibility in the future (similar to Skyrim's post-release co-op mod), Obsidian has confirmed they have no plans to add multiplayer support post-launch.
Currently, no Avowed co-op mods are publicly known. Creating such a mod would be a significant undertaking.
In short: No, Avowed does not offer any form of multiplayer.