Open dungeons
Open dungeons and their levels: Ship 20, Seona 25, Ezulan 30, Gorgodia 35, Lost Castle 40. Hatchling Paradise (45) opens with the level cap raise.
Keys
Talk to the dungeon NPC (for example Harok) while carrying a key. Party keys drop from field monsters and from bosses inside dungeons, and the Pope's daily quests give one every day.
Boss drops
Dungeon bosses always roll their drops and pay full gold whatever your level. In the open field, monsters 11 or more levels below you give no drops or gold.
Armor drops
Armor drops are split: Ship, Ezulan and Lost Castle drop gloves, legs and boots; Seona, Gorgodia and Hatchling Paradise drop helms and chests.
Dungeon Bots
Fill your dungeon party with companions: see Dungeon Bots.