Multiplayer action/adventure games for Xbox One with 6-player online support
Terraria
Players: 4 local, 8 online
No Man's Sky
Players: 0 local, 8 online
Happy Wars
Players: 0 local, 15 online
Don't Starve Together
Players: 2 local, 6 online
Players: 4 local, 8 online
Players: 0 local, 8 online
Players: 0 local, 15 online
Players: 2 local, 6 online