Of the 16 main areas from the story, 10 of them will have challenge maps that will require more than just a strong character. These will all unlock after completing the main story and are all accessed from quests at the Quest Shop. Clearing each one will reward you with a Legendary piece of normal equipment.
Blood Parch Challenge Stage
The first challenge stage presents you with an interesting puzzle. There is only one enemy you have to defeat, but it’s at the opposite end of the map, with a lot of Absolute Area panels in between. Absolute Area is an effect that is three-in-one; it acts as No Entry, No Lifting and Invincible. First and foremost, ignore the Lucky Boards already on the map, as they are just there to distract you from the main target. If you look at the enemy, you will notice it is standing on a panel with the Disperse Damage effect, which means that there’s another one on the map. Look near your base and you will see it, as well as a portal that will shoot out an enemy (Lucky Board) on each turn that will always rest on the panel with the Disperse Damage effect.
The catch is that there will only be three enemies coming out of the portal and they start at level 50, with each one that follows being 50 levels higher than the previous one. The second thing you need to be aware of is that their HP total doesn’t equal or exceed that of the Slust that is at the top of the map, so defeat the three Lucky Boards and you’ll have to retry the battle from the beginning. So, that means you’ll need to have some powerful characters that can deal at least 17k or so total damage per Lucky Board. It’s also possible to cheese this if you have a Witch or Skull with a high-level (from using it; not from using Mana at the Skill NPC) elemental spell and the Expand Evility. With this, you should be able to hit the Slust (using the diagonal pattern) when moving as close as possible.
Spirit Interment Challenge Stage
A highly annoying stage and one I recommend having a high-level character to clear it, who is equipped with Poison Vaccine. When you begin, you will only be able to bring out a single character, who can’t step off of the Base Panel, due to it being surrounded by No Entry panels. As soon as the enemy’s turn begins, the No Entry symbol will move onto the green panel. The annoying part about this stage is that you can’t harm any of the enemies, since they will always be resting on Mighty Enemy panels, making them invincible.
To make matters worse, when the Wights defend, you can’t enter within 2 spaces of them, because of Hold the Line. Your goal is to put up with the attacks and move to the end of the stage to destroy the Mighty Enemy symbol on the red panel. You do this by moving in front of each zombie and enticing them to attack you, which will make it so you can lift them to toss them out of the way. Once it is gone, just beat them up to finish.
Icic-Hell Challenge Stage
This is a deceptively looking stage at first glance, but it’s actually quite devious. There is only a single Prinny on the map, who is standing on a panel that grants him invincibility, as well as a No Lifting and Ally Lonely effect. The Prinny will move along a set path and on his third turn, he will rest on a space with the Game Over effect, making you lose.
Before you start the stage, you want to equip a character (it doesn’t matter who, but pick one who has a high base movement) with three Accelerators, which you can get from the Bonus Gauges from Martial Training 4 and 5. You can also place the character you’re using outside of the Base Panel, then use the Professor’s Medical Care skill to buff movement and jump. Once you can get next to the Prinny, wait until he’s right next to the yellow block, then pick up him and toss him anywhere to finish the stage.
Dragon Fang Challenge Stage
This fight will basically boil down to a one-on-one fight with the Carnage Princess, since there is the Lonely effect pretty much on the whole map that isn’t affected by the No Entry or Absolute Area panels. Depending on when you do this, it could be a challenge or a breeze. The Lady Samurai’s unique Evility makes it so she deals more damage whenever she is attacking a single enemy, which is the case here. She’ll also get the added DEF +50% bonus from the Geo Effect, so she’ll take less damage than usual. As soon as you enter the area with her, the No Entry symbol will move onto a green panel, essentially locking you into the arena with the Carnage Princess. Two people enter the arena and only one will leave alive!
Sandcano Challenge Stage
That is not a typo in the table above, as there are truly 76 Hitmen on the map. All of them are level 120 and only have 1 HP, because of the Secret Recon Evility. In fact, they all have an insane movement stat, while you will be stuck at your Base Panel, which is surrounded by Absolute Area panels. If you have a high level character, then you can just sit there at your base and kill the Hitmen as they come to you. However, if you have a Sage with Land Decimator or any character with Izuna’s Overload skill, Comet Disaster, can hit all of the enemies at once. Remember that there is a Netherworld Effect on this map, reducing your accuracy by 20%.
Note: This map is a great first spot to start farming Shards/Extracts for your characters until you can start doing Carnage Phantom Copies or Martial Training 4. Equip your Sage with the Megaphone and either do Land Decimator or Comet Disaster, if you have access to it. Also, the DLC Metallia has an Overload skill that can capture all non-Boss enemy units.