Dungeons
From IdleOn MMO Wiki
Summary
Dungeons are a type of activity that allows a player to enter into an instanced server to complete objectives alone or with friends using the new party system, both of which were released with version 1.x (input version here). There are currently 2 dungeons, one located at Froggy Fields in Blunder Hills, and the other located at Bandit Bob's Hideout in Yum-Yum Desert.
Dungeon information coming here. Have a cookie while you wait. Actually, have all of the cookies.