Aion 2 dungeons are several systems, not one queue. Sealed dungeons are numerous solo-style exploration instances on each faction map (community counts put about 61 on each main map). Expeditions and later difficulties (including Nightmare and Transcendence in progression tables) are group content with item-level gates.

Sealed dungeons

They show as question marks until explored. Rewards cited by companion wikis include Daevanion Crystals, Wisdom Stones and enhance materials. Other-faction sealed dungeons via rifts pay differently. Named examples exist per map; this page will not invent a full loot table.

Group dungeons

Progression walkthroughs place expedition milestones in the 20s–30s and Abyss / Nightmare / Transcendence around the level-45 endgame band. Entry item level is a gate, not a skill check. Bring the right roles.

Markers

Dungeon boss markers and portal markers help you find entrances and bosses in range. They do not complete the instance.