Group Dungeons - Albion Online Wiki
https://wiki.albiononline.com/wiki/Group_DungeonsGroup Dungeons are locations which can be entered through a dungeon entrance which will take you to another map. They are designed for groups of 3-5 players. They may contain from one to five floors. They don't differ in the level of difficulty. The dungeons end with a final boss, with a mark on the ground. However you may meet bosses before.
Dungeon Maps - Albion Online Wiki
https://wiki.albiononline.com/wiki/Dungeon_mapsDungeon Maps. Dungeon Maps are an item introduced in the Oberon update that can be obtained as a loot drop from mobs and dungeon chests. They allow a party to open a hidden entrance to a Randomized Dungeon of greater-than-normal difficulty and rewards. Maps exist in the range of Adept to Elder (T4 to T8) with the possibility of uncommon, rare and exceptional variants.