Instance DungeonTo gain more items and equipment, Explore is a good choice. For now there are 10 instance dungeons in Castlot, let's see what and where are they, and which level you should achieve to start these fights.
1. There's no tries limit in Explore, as long as you have enough troops and golden/silver keys.
2. If you lose all of your troops but still win the battle at the end, yet you can get the rewards for winner.