Dungeons are team battles.
You can challenge Dungeons a maximum of four times a day, and each Dungeon a max of two times (ie you can only attempt the highest level dungeon twice).
Higher level Dungeons give better rewards, higher Grade Items and more Mount Items.
You can either invite other players, or hire random ones. What kind of teammates will you get?!
There’s a 30min cool-down timer after hiring teammates, so you’ll have to wait before you can hire again for your next battle.
You can of course team-up with friends of alliance mates and fight together! Are they gonna be as strong as hired adventurers though…? Who knows…
If you’re defeated or exit part way through, you will not lose any of your attempts. If you lose, try teaming-up with more powerful teammates, or increasing your own Power before trying again.