1. Floors:

The Ancient Colossus' skills have been changed from how they were in floor 5. It will now have the following skills:

1) Rock Pound: Deals 180% P.DMG to 1 enemy, and decreases the enemy's energy by 2.

2) Landslide: Deals 100% P.DMG to all enemies, and decreases the P.ATK and C.ATK of all targets by 20%.

3) Divide and Conquer: When Ancient Colossus drops below 70% HP, it will split into four small statues (they will merge into a Colossus again after three rounds).

Ancient Colossus' basic attacks now reduce the player's energy, thereby disrupting the casting order of skills. Take that into consideration if your lineup relies on energy. The Ancient Colossus's AoE skill reduces the P.ATK and C.ATK of all enemies hit, which limits your damage output. To make matters worse, one of the conditions for a perfect clear is beating the level within 5 rounds. So you will require a lineup with high damage.

2. Strategy:

1) As the clear conditions require you to clear the floor in 5 rounds, you need a strong damage-oriented lineup. Consider using an extra damage dealer in place of a healer to kill the boss as fast as possible.

2) Since Ancient Colossus splits into smaller statues, it's recommended to include a Saint with powerful AoE damage in your lineup.

3. Recommended Lineup: Kiki + Wolf Nachi + Sextans Luna + Pegasus Seiya + Scylla Io + Unicorn Jabu

The main damage dealer here is Io. Luna blesses Io enabling him to act twice in one round, thus dealing high single-target damage. As the Ancient Colossus will reduce your energy in the early stages, using Luna + Io enables you to dish out high damage at the cost of only 3 energy. Jabu can use his AoE to take out the small statues once the Ancient Colossus has split, making you able to beat it within 5 rounds.

4. Cosmo

It is recommended to use [Tenacity] as your Lunar Cosmo, since Ancient Colossus deals physical damage. This also gives you enough HP to survive. Your other Cosmo should be of as high a level as possible. If your support Saints are low level and have weak Cosmo, consider using Mandala or Hephaestus' Armor as their Legendary Cosmo to increase their survivability. You also need one Marsh Fairy on your team.

5. Battle

In the beginning round, buff Io's attack with Nachi and bless him with Luna. Use Io's basic attacks multiple times against the Ancient Colossus until you trigger the split. When Colossus splits, use AoE to chip away at the statues' HP, and then finish them off with single-target skills.

6. Replacing Saints

1) Io can be replaced by another high single-target damage Saint, such as Scorpio Milo, Golden Arrow Seiya, etc.

2) Jabu can be replaced by another high AoE damage Saint, such as Phoenix Ikki, Cassiopeia Erda, Aquarius Camus, Leo Aiolia, etc.