This mod was made with Mcreator and the goal is to allow modpack creators to create a dimension with the adventure game mode when the player enters it. Of course when the player leaves the dimension the survival gamemode is reactivated.
It's same portal of nether but with "Smooth Quartz" and with "Mystical Energy Gem".
Be careful, if the player dies in this dimension and respawns in another he remains in adventure gamemode.