Running this mission with average gears can be hard, but it's easier if you have a mass DEF debuffer like Cannon Main here. Debuff, kill, move forward, repeat your way to victory.
This is one of the easier and faster Dogon missions. Was a lot easier before the Three Gateways patch but still very doable with average gear (+4 evil weapons type average). No bosses to kill. Kill all mobs as you move north and destroy 4 buildings (prisons) to complete the mission.