The Jura Forest Alliance (ジュラの森大同盟, Jura no Mori Dai Dōmei), established by Rimuru Tempest. The alliance was first established between Tempest and the Lizardmen, to repel the Orc Army led by the Orc Lord. After their defeat the alliance was not disbanded as Rimuru saw a need to prevent the orc species from starving. Hence, the goblins and orcs joined the alliance. During the first meeting to discuss the war reparations and how to prevent the orcs from starving, the Dryad Treyni offered to provide them with the necessary supplies. The condition being that the treants, the dryad's beneficiaries, be allowed to join.
The Lizardmen offered fertile fishing grounds and fish. Tempest can provide processed goods. The goblins across the forest provided living spaces, and the orcs excel at manual labor.