After contracting with Luna, you can enter Midgard Castle.
Go back to Midgard. The entrance to the castle is in South Midgard, in the upper middle of the area. Go into the castle. Before you talk to Edward, you will have to wait in a room. Don't try to leave. After Lyzen and Edward leave, exit the room and follow the path to the right.
After the cut scene, you can talk to the people in the magic research center. Afterward, leave the castle. There will be a cut scene.
After the cut scene, go to South Midgard and enter the castle gates.
When you are back in control, buy supplies if needed. When you are ready, go back to the castle, go upstairs, and go toward the conference room.
If you reach the boss in one day, it is rumored that you will get 50,000 gold.
Your goal is to reach the leader of Dhaos's army as quickly as possible. There will be enemies floating around the battlefield, as well as some enemies that are stationary that will run up to you if you get too close to them.
Time is measured in steps, not minutes, and time also passes during battle, so if you walk as little as possible, and avoid as many battles as possible, you will reach the boss before too many days pass.
Hug the edges of the path when you can, to minimize the number of steps you take. Try to avoid monsters, but don't go too far out of your way.
If you reach the boss within five days, you will get 10,000 gold.
There are no items or skills to collect in this area right now.
In the first screen, there is an inn and a small item store if you are not concerned about time.
The monsters that you will encounter here are Old Oaks (use Ifrit and Thunder Blade), Chimeras (use Luna and Ray), and Agumis (use Sylphs and Stone Wall).
The quickest path to the boss is north three times, east, north, east twice, north twice, east, north twice, east three times, and north.
At the save point, equip Mint and Arche with Princess Capes (use a Rune Bottle on a Silver Cape to turn it into a Princess Cape if you need to), Klarth/Claus with the Garnet Ring, and Cless/Cress with a Flame Mantle. For the formation, have everyone but Cless/Cress at the far left, so Cless/Cress has room to move if he gets caught near Ishrantu. Tell Klarth/Claus and Arche not to cast spells so you can cast them manually.
Constantly use Ray and Maxwell to prevent Ishrantu from casting Fire Storm. Have Mint ready to heal at all times, but make her cast Hammer during the battle. Cless/Cress needs to keep his distance and use long range skills only.
When the battle is over, go into the castle. You will be healed up during the cut scene. After the cut scene, buy supplies and food. Be sure to buy Flare Bottles. Then exit the castle.
When Cless/Cress is alone, go up to meet the Valkyrie.
Arche and Cless/Cress will have to do battle in the air. Since Mint and Klarth/Claus are not with you, you will have to use items to heal yourselves. Cless/Cress is unable to use skills.
Have Arche use Thunder Blade against the Vulturas while Cless/Cress attacks.
Don't let Arche use any spells against the Charons. Use a Flare Bottle on Cless/Cress and have him attack. If a Charon is too low for Cless/Cress to hit, have Cless/Cress walk far away from it and then tap A twice to make Cless/Cress jump.
In the next battle, have Arche attack the Demons and Vultura with Thunder Blade, then have Cless/Cress beat the Charon as before.
Against the three Demons, have Arche use Ray and have Cless/Cress just attack as usual. Keep your HP high to be ready for the boss.
Ishrantu is the same as before. Keep attacking with Ray to prevent Ishrantu from casting Fire Storm, use a Flare Bottle on Cless/Cress, and have Cless/Cress keep his distance while attacking. Heal up right away if Ishrantu casts Fire Storm.
After you defeat Ishrantu in the sky, it is time to storm Dhaos's Castle.