Born in Arlia, Dias is Rena's childhood friend. They have a brother-sister relationship. When he was a child, a traumatic event became his motivation to train to become a warrior and his swordsmanship is now renowned throughout Expel. He tends to distance himself from others, giving him the air of a cool, lone-wolf warrior.

Dias Flac (ディアス・フラック, Diasu Furakku?) is one of the main characters in Star Ocean: The Second Story and its remake Star Ocean: Second Evolution, later reappearing in Star Ocean: Blue Sphere.


Spoilers, plot and/or ending details follow. (skip)

Star Ocean: The Second Story/Second Evolution

Dias was born and raised in Arlia, and is Rena's childhood friend. He thinks of Rena as his "other little sister" since she would often play with Dias's younger sister, Cecille.

Two years prior to the events of the storyline, Dias and his family were attacked by bandits. His parents and sister died, and Dias himself was badly injured, but he managed to survive. After that incident, however, his life changed: he came to believe he was somehow responsible for the death of his family, for not being able to protect them. Dias then left Arlia and travelled all over Expel, becoming a renowned swordsman.

Dias is met for the first time in Marze, when the children of Marze are held captive in the Forest of Symbols and a plan is being devised to rescue them. As it turned out, Dias was hired to attempt to rescue the children. If Rena is the chosen protagonist, Dias will join temporarily to help Rena carry out the rescue mission. After the events that unfold, Dias says to Claude that he anticipates the day their swords will cross, and he heads off again.

Dias Enters Lacour Arena

Dias enters Lacuer Arena.

Dias later reappears in Lacuer during the Lacuer Armory Contest, in which he is a participant. It is then that Dias and Claude finally face off against each other. Not surprisingly, Claude loses the fight against Dias. Nevertheless, Dias acknowledges his strength, and says he looks forward to seeing him again.

Near the end of the first half of the game, at the Lacuer Front Line Base, Dias runs into Claude and Rena once again. If Claude is the protagonist, he and Dias will ensue in a short conversation, after which Dias asks Claude to protect Rena for him, and then he leaves. If Rena is the chosen protagonist, however, the player can opt to make Dias a permanent addition to the party.

Star Ocean: Blue Sphere

Dias Blue Sphere

Dias in SD 368.

Little is known about where Dias went during the two years between the games. It is likely he reverted to his old ways of wandering the world alone, looking to better himself and his sword.

Precis manages to find him and ask him to join the cause. Dias then volunteers to join, so that he may protect them himself. He mostly joins out of duty to Rena, wanting to continue to protect her.

Spoilers end here.


He may not like dealing with others, but he causes chaos everywhere he goes regardless.
—Celine Jules on Dias

An expressionless swordsman, Dias' eyes sparkle with a cold light. He is cold, callus, and arrogantly proud. The blue-haired warrior enjoys practicing his own unique swordfighting style that he developed himself, meshing the Edarl sword style with the martial arts of Karate. Disliking bandits and robbers with a hatred born of the murders of his family, Dias enjoys simple pleasures such as food and sleep.

Dias' favorite instrument is the Cembalo, while his favorite foods are Chicken Skewer (in Second Story) and Shish Kebab (in Second Evolution).


Star Ocean: The Second Story/Second Evolution

Dias uses a fighting style very similar to iaido, the Japanese sword-based martial art associated with unsheathing and re-sheathing one's sword for quick-draw-based strikes. He is often considered the most powerful character in the game, tied with Claude, Ashton and Welch. All his stats are very high (although his CON is much lower than Claude's), while also being a notably mobile character, having the second highest faster movement speed (after Chisato).

Most of his Special Arts are fast and deadly, usually with a low MP consumption, and reach their Top Proficiency fast, meaning they achieve full potential in short time; however, Dias tends to fall a bit behind in damage output compared to other fighters as many of his Arts lack high multi-hit properties. His normal ground attack has one of the highest ranges, although a slow start-up. Among his notable Arts are Air Slash, which is much faster than Claude's, being the staple of his gameplay until the end of the game; and Deadly Illusion, which is the fastest Special Art in the game.

In Second Story, the accessories Meteor Ring and Slayer Ring had no effect on Dias. This has been fixed in Second Evolution.

In the remake version when the player controls Dias during random battles, Dias can slash his opponent three times.


Name Starting Gain
Level 35 NA
HP 2500 NA
MP 250 NA
STR 175 3-6
CON 70 1-3
DEX 120 3-4
INT 64 1-3
STM 45 0-1
GUTS 50 0-1
SP 200 NA

Special Arts

Name MP Cost Attribute Damage Level Learned Rank Up Changes Base Effect
Air Slash 4 NA Short: 50%/2 hits, Long: 100%/1 hit Default 100+ uses, 1 increase Extra hit, Damage +50% Short: 128, Long: None Deliver a shockwave.
Chaos Sword 5 NA 100%/1 hit Default 120+ uses, 1 increase Extra hit, Damage +100% Short: 96, Long: 576 Strike at the enemy with a sword filled with the miasma of powerful demons.
Crescent Cross 8 NA 100%/2 hits Default 120+ uses, 1 increase Damage +50% 192 Jump into the air and deliver a vertical and horizontal slash.
Pale Moonlight 10 NA 150%/1 hit Default 130+ uses, 1 increase Damage +50% 128 Deliver a powerful shockwave that extends all the way to the sky.
Gale Thrust 10 NA 200%/1 hit 40 130+ uses, 1 increase Damage +50% 576 Charge at the enemy at wind-like speeds and deliver a powerful thrust.
Moonlight Arc 13 NA 100%/1 hit 48 100+ uses, 1 increase Damage +100% Short: 512, Long: 576 Deliver a crescent-shaped shockwave.
Phoenix Drive 16 Fire 100%/2 hits 56 100+ uses, 1 increase Damage +50% Short: 128, Long 768 Fire off a burst of inner energy in the form of a flock of phoenixes.
Full Moon Slash 25 NA 100%/1 hit 63 100+ uses, 1 increase Extra hit, enemies trapped longer Short: 512, Long 768 Draw a circle with the tip of the sword and trap enemies in a ring of destruction.
Deadly Illusion 21 NA 100%/2 hits 70 210+ uses, 2 increases Extra hit 32 Deliver a rapid succession of blows in a beautifully choreographed sequence.
Phoenix Blast 30 Fire 100%/2 hits 78 100+ uses, 1 increase Extra hit 576 Intensify the inner energy throughout the body and fire it at enemies in the form of a swooping phoenix.

Star Ocean: Anamnesis

Dias flac icon Dias SOA Defender

Information Sword & Sheathe - Gacha Permanent - ACE 5☆ to 6☆
Expel's Renowned Swordsman DEF +20% & ATK Damage taken -20% (All Allies)
Aloof Swordsmanship ATK +30% & DEF +20% (Self)
Oath to Cecille Will not flinch to damage under 25% Max HP (All Close Range Weapon Allies)
Encountered a Worthy Rival Damage +20% (All Attackers & All Defenders)
Rush Combo
Additional Effect Power Max Hit Count
Deadly Illusion AP Consumption -50% (Self 20 seconds) ATK x 3,500% 10
AP Cost Power Max Hit Count
Annihilating Air Slash 20 ATK x 200% 5
Double Slash 20 ATK x 200% 2
Dragon Roar (Dark Element) 29 ATK x 340% 2
Diabolic Whirl 29 ATK x 340% 5
LB 10 Level 70 Stats
HP 22,155
ATK 2,799
INT 1,509
DEF 2,867
HIT 812
GRD 1,036

Cherry cloud dias flac icon Cherry Cloud Dias SOA Shooter

Information Dagger - Gacha Permanent - ACE 5☆ to 6☆
Armory Contest Winner Will not flinch to damage under 15% Max HP (All Allies) / Agro Rate +2 (Self)
Cultivated Victories Damage +40% when under agro (All Allies) / ATK & INT Damage taken -20% when under agro (All Allies)
Memento Ring Damage +50% when not under agro (All Allies) / Critical Rate +20% when not under agro (All Allies)
Changing Heart ATK +15% (Self) / DEF +15% (Self) / HP +30% (Self)
Rush Combo
Additional Effect Power Max Hit Count
Phoenix Blast (Fire Element) Single Target Damage +30% (All Allies 20 seconds) / AP Recovery Speed +50% (All Allies 20 seconds) ATK x 4,000% 10
AP Cost Power Max Hit Count
Lightning Chain (Lightning Element) 16 ATK x 160% 9
Dancing Sword 40 ATK x 1,300% 7
Dancing Sword 40 ATK x 1,300% 7
Phoenix Drive (Fire Element) 20 ATK x 490% 2
LB 10 Level 70 Stats
HP 18,564
ATK 2,854
INT 1,523
DEF 2,099
HIT 1,239
GRD 910

Family Tree

Dias Tree


The Second Story/Second Evolution
Blue Sphere
Material Trader


  • Dias cannot join the party unless the player selects Rena for the playthrough.
  • Some time during Dias' and Rena's youth, the young swordsman gave Rena a tiara made of grass as a gift.
  • In Second Evolution only, Dias can keep his Swallowblade sword after the Lacuer Armory Contest (it was originally named Sharpness in The Second Story).
  • Originally, in The Second Story, there were no PA's whatsoever that involved Dias. This has been changed in Second Evolution, where he has PA's added.
  • Dias' voice actor, Kyle Hebert, is also the voice actor of both Crowe F. Almedio and Arumat P. Thanatos from Star Ocean: The Last Hope.
    • Likewise, Dias in the original Star Ocean 2 shares his Japanese voice actor with Bowman Jeane.