Agatio and Karst will approach Isaac and Ivan. Karst is happy to see that happened. Isaac figures out that they ressemble Saturos and Menardi. Karst admits that and tells them that they are all from a Fire Clan, up in Prox. Their aim is to light the lighthouses. Ivan tells them off. Agatio says that only battle can resolve this.

Karst says that they defeated Saturos and Menardi because all four people were there. But Isaac and Ivan are ready to battle nevertheless, so the battle begins (which is quite funny, as you see them fight without the battle screen). Felix and Co. worry about Isaac and Ivan, as well as poor Garet, who could fall any second now. Kraden urges everybody to go up and help them.

Enter the door. Enter the door in northwest. Go north. Use Reveal to get through the pillars, and go north to the staircase. In the room with pillars, jump to the ledge with a slope. Slide down it, then go west and climb a ladder. Alex will appear. He will ask if you have come here to light the beacon. He will then use Psynergy on you to heal your party. Maybe he wants you to defeat Agatio and Karst. He will tell you to go on. Prepare yourself for a boss battle, as this is the last time you will have your whole party together before the battle.

Once you are outside, Agatio is finishing off Isaac. Both of them will mock Isaac and Ivan. But they are surprised that Isaac and Ivan are still alive. Felix and Kraden will go up. Karst is angry that you still haven't lit the lighthouse.

They will then force you to take the Mars Star from Isaac. Felix will go to Isaac and Ivan and take the Mars Star. They leave. Felix also follows them and leave the others take care of Isaac and Co. Piers calls back and he would like to give you a hand. He will joins Felix.

Back inside, go north through the staircase. In floor 6, jump across the white blocks and go south. In this room, enter the staircase in the west. In floor 7, go south and you will be at the aerie once again.

Once you've reach the aerie, Karst will blame you that you are late. Walk up to the aerie and light the lighthouse.

Once the Jupiter Lighthouse is lit, your alliance with Karst and Agation seems to be broken. Agatio and Karst will block your way back and they will want to finish you off here. Karst will steal your Mars Star when you are talking. Well, show your color to the thieves.

Battle:: Try to keep Felix and Piers alive at first. After Jenna joins you, you should let Jenna use Wish or Pure Wish each round. Let other unleash Djinn and occasionally use strong psynergy such as Odyssey or Diamond Berg. Sheba should unleashed and summon. If you can maintain full health, this is not a very hard battle.

After the battle, Alex will come and cure Agatio and Karst. They will blame Alex for fully healing them and helping them beat Felix and Co. Alex will then leave with Agatio and Karst.

Isaac notices that the lighthouse is lit. Garet becomes angry with Jenna. Isaac asks Kraden why they lit it. Kraden tries to explain but Isaac and Co. are convinced that it is destructive to do so. Ivan decides to continue the conversation back in Contigo. Say Yes to it. Isaac will greet you and go down first.

Felix and Co. will take the elevator. Use Retreat or climb down the ladders to leave the lighthouse.