If you are looking for an epic journey to share with friends, several standout multiplayer adventure games span open-world exploration, narrative-driven co-op, and high-action campaigns.
Here are the top games offering incredible multiplayer adventure experiences:

Baldur's Gate 3 – Supports online cooperative play for up to four people [Baldur's Gate 3 ]. It offers a massive, highly reactive fantasy RPG world where you and your friends can split up, plot elaborate ambushes, make impactful (and messy) narrative choices, and tackle deep tactical combat together.

Sea of Thieves – The ultimate open-world pirate adventure. You and a crew of friends manage a fully interactive sailing ship [Sea of Thieves ], hunt for hidden treasure on tropical islands, tackle world events, and engage in pulse-pounding ship-to-ship combat against other players [Sea of Thieves].

It Takes Two – A genre-bending platform adventure built strictly for two players. It constantly introduces fresh, imaginative cooperative mechanics as you work together through a heartfelt and hilarious story, utilizing the Steam Friend's Pass to let a friend join your game for free.[1]

No Man's Sky – A boundless, procedurally generated space exploration game [No Man's Sky ]. You can team up with friends to build planetary bases, trade, upgrade starships, and seamlessly transition from space flight down to strange new alien worlds together [No Man's Sky].

Elden Ring – For a greater challenge, this open-world masterpiece allows you to summon friends for online co-op to explore vast landscapes, conquer legacy dungeons, and take down towering bosses together (with community mods even expanding seamless group play) [Elden Ring].
If you let me know what platform you're playing on (PC, PlayStation, Xbox, or Switch) and how many players you want in your group, I can narrow down the best recommendations for your specific squad.