This Gamepass lets you create a Sandbox Server. In Sandbox, you can spawn any enemy and place as many heroes as you want you can also edit the stats of heroes you own. You will also get the "Infinite Heroes", "Infinite Mana", "Spawn Enemy", and "Wave Skip" Modifiers which can be used on casual mode, equip them in the server creation menu. There is a limit of 4 players per Sandbox Server!