Obsidian Conflict is a cooperative multiplayer modification set in the Half-Life 2 universe. It features a large amount of new gameplay features on all-new maps specially designed for the mod with focus on cooperative gameplay, as well as over hundred user-made maps following the same formula. In addition to that, You're able to play through vanilla Half-Life 2 all the way up to Episode 2, as well as experimental support for cooperative Half-Life: Source play.
This mod is great it hold many different ideas then most other mods and is very unique. It is very player friendly and the community has always been great. You never have to deal with grumpy players or abusive admins. This mods holds many great moments to me so 10/10 on my part