At level 90 you can also start doing the daily Goonzu quest. All you need to do is go to Moscow and kill 50 Blazing Lizards nearby then turn in a Brush. Doing this 3 times will grant you access to the Goonzu dungeon for 2 hours. The Goonzu quests are difficult but the drops in the dungeon is great. The dungeon itself is only open on weekends but you can collect the passes any time. All of the rare craft mats (Still-Beating Heart, Warrior Sign, Crazy Lord's Seal, etc.) can drop from mobs inside the dungeon. It is very difficult for anyone with mercs below 100 to survive here even if they are in a team.

At atlantica gold level 90, you can also start doing the first Individual Dungeon. Individual Dungeons are instance dungeons generated for a party. They have a cooldown timer like all other instance dungeons. There is a bit over 40 mobs including 1 boss. You are only allowed to use 6 people in your team instead of 9. The mobs give about 3 times the exp of other mobs of the same level and have a good drop rate of equipment boxes. There are basically 2 split paths with mobs on them eventually converging on the boss. The mobs have very high damage though. In general you can expect something like about 800k exp to all your mercs if you fight together although someone will have to split up and solo if you want to be able to clear it in time. Clearing the dungeon will also reward you with a box that will allow you to pick from 1 of several powerful weapons. These weapons only have a level requirement of 90 as well and are stronger than Conqueror +1 weapons. The boss also has a low chance of dropping the said boxes. Each dungeon also has a special drop that you can collect and trade in for one of the possible items from the box you obtain for clearing the dungeon of your choice.