This dungeon has no Heart Orbs, and no way to recover HP. This raises the dungeon difficulty significantly. You need to carefully consider your moves so that every round deals damage, and clear out enemies that are about to attack if possible.
There are 10 battles in this dungeon, so take care to prep your skills before the boss battle. Due to lack of recovery, try to stall on early weak monsters, and be sure to keep an eye on HP.
The final boss Blue Flower Dragon, Starling attacks every round. Since there are no Heart Orbs, there are two strategies: either kill it quick before it kills you, or wear it down with an auto-healer. Since this is a Technical dungeon, it is much harder than the Sky Dragon dungeon of the same element.