One of several objectives in the "For the King" campaign, this can actually be obtained out of order if you play other scenarios first. This dungeon can also be encountered in rotation for the "Dungeon Crawl" campaign, which will task you with clearing five scaling Realm Dungeons to complete the game. This happens to be one of seven possible choices, if you happen to have the Guardian Forest biome. Most times you encounter it, in either scenario, it will be a two-floor dungeon with multiple rooms a piece. Beyond that tip, it shouldn't cause you too much problem that you can prepare for if you are around the dungeon's level and prepared to heal just in case (as should be expected in any dungeon).