The boss fight with Der Suul will happen right after the events in the Trei'kur Slaughtery. The biggest annoyance with this boss battle is that you can't save directly before it, which means you'll have to do all of the stuff at the end of the Slaughtery over again if you happen to die against Der Suul, which is definitely possible, as he is a challenging boss.

Before you go to fight him, you can do a few things to prepare yourself for the battle. If you have the Synthesis specialty skill maxed out, you will be able to use six items when trying to create a new one. Should you happen to have six Wires on hand (you can buy some in Central Resulia), use those to try and get a very nice piece of armor called Elemental Leather (SAVE BEFORE ATTEMPTING AND AFTER A SUCCESSFUL ATTEMPT). This armor should have a good 100 or so more defense over the best store-bought armor, as well as +40 to four resistances.

In addition to the above, if you happen to have a lot of Silver and Fire Gems in your inventory, you can use those to create Fire Armlets with the Smithery skill (level 2; four Silver and one Fire Gem). You only want to try to create some for your melee characters, as Fiore, Miki and Emmerson should be kept out of the way. Depending on how many you make, you can use Augmentation to stack the 5% chance to null fire damage onto a single Fire Armlet.

With all of that out of the way, it's time to face Der Suul. When the battle begins, take out his cronies, knowing that more will periodically show up as the fight drags on. Unless they're annoying you, it's best to ignore them and concentrate solely on Der Suul. Speaking of him, Der Suul starts out rather simple and will switch his skills up at 50% health.

- Normal attacks (can hit multiple characters)
- Stomp - Melee attack that hits one character
- Oculus Flare (50% and below) - Shoots a large fireball at a single character
- Spicule (50% and below) - Jumps into the air and crashes into the ground, creating a large explosion that hits multiple times for heavy damage

The one move you want to keep an eye out for is called Spicule, which is very dangerous and could possibly one-shot some of your weaker characters. It is imperative that you manually control Miki, Fiore and Emmerson to keep them away from the action, if you are able to, since the blast radius can be quite big. The worst thing about this is that Der Suul has the potential to spam this move over and over, so it's random on whether or not he wants to destroy your party.

If you have Faerie Light for Miki, that should be the only healing spell she needs (otherwise use Faerie Healing), in addition to Raise Dead. One of the simpler ways to do this battle is to keep control of Miki and just spam your group heal whenever anyone has lost some health, as the AI has the tendency to not cast it right away. This should hopefully keep everyone's health topped off, although it's still possible for a character or two to die from Spicule.

Check out the full guide: http://www.gamerguides.com/star-ocean-integrity-and-faithlessness/information

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