How to Unlock The Stigma Dreamscape: Dungeons

Arrive at A-4 Command: Encounter two packs of four enemies, then another pack of four, followed by a pack of three near the next door. Beware of the Level Tricker's AoE.

Clear A-4 Command: Defeat Proto-Omega. You will receive a Treasure Coffer.

Arrive at A-4 Conquest: Face a group of four Omicron Invaders, then two Lambda Invaders that use a Tankbuster ability called Wheel. A Treasure Coffer is located to the side before crossing. Further ahead, encounter a pack of four including a Delta Invader with a line-AoE, followed by another pack of three. Pulling both groups is possible but will result in heavy damage. A second Treasure Coffer is at the end of this path before the boss.

Clear A-4 Conquest: Defeat Arch-Lambda. You will receive a Treasure Coffer.

Arrive at A-4 Headquarters: As you slide down the path, a pack of five enemies will aggro, followed by two Hybrid Dragons that use a line-AoE which can be Stunned. A Treasure Coffer is found at the wall. You will then encounter a pack of three enemies, followed by a final group of three including an Omega Frame. This is the toughest pull, so ensure the Healer is prepared. Another Treasure Coffer is to the side of the path leading to the boss.

Defeat Stigma-4: Defeat Stigma-4 in the final boss battle. The dungeon is complete, and you will receive a final Treasure Coffer before the exit.