space strategy game, Stellaris, multiplayer session, DLC content, sci-fi themed, alien races, galactic empires, starship fleets, interstellar warfare, diplomacy, exploration, cosmic anomalies, futuristic technologies, space habitats, diverse ecosystems, grand strategy, real-time with pause, dynamic alliances, procedurally generated galaxies, advanced AI, epic space battles, multiplayer cooperation, competitive gameplay, mod support, expansion packs, high-resolution textures, detailed star systems, ambient space music, strategic zoom, 4X game mechanics, user interface mods, custom empires, alien diplomacy, wormhole travel, light speed, multiplayer lobby, cross-platform play, downloadable content.