Co-op is far easier to play in Elden Ring than it has been in any previous FromSoftware game, but there's still some annoying limitations that stop you and your friends from forming the Tarnished posse of your dreams—unless you use the Seamless co-op mod, that is.
In a regular multiplayer scenario, if you die or defeat a boss, the co-op session is considered complete and your ally is whisked away back to their game world. While joining someone's world this way for co-op shenanigans does net you rewards, the progress doesn't carry over, meaning you'll still have to defeat the same boss or area yourself. A particularly terrifying prospect if Malenia's your target.
