Asgard GateEditAsgard Gate is a building that allows you to summon Heroes to your village.
Every level of Asgard Gate unlocks one additional hero for free.
The Asgard Gate is a direct link to the gods' world! Recruit and summon legendary heroes from it, and let the rule the battlefield!
In Asgard Gate you can see all of your Heroes as well as their levels and stats. You can also Craft Basic and Master Craft Items for your Heroes from inside Asgard Gate.
And when you want to Switch Heroes, this is the place to do it!
Here is a Tutorial from Corbell from December, 2014 on -- How to Replace Heroes.