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"Our business is done. Shall we head back home? Kiki, Lolo, Una, Gonji, and all the others are waiting."
— Radius

Radius (ラディウス Radiusu?) is the wise chief of Arni and a former Deva of the Acacia Dragoons in Chrono Cross. Before Serge ventures to Lizard Rock, he serves as a tutorial instructor for battle mechanics, Element Use, and Stamina. Radius also makes an appearance in Radical Dreamers: Nusumenai Hōseki as an imprisoned Dragoon.



Radius appears as an elderly man. With thick eyebrows, a thick beard, a mustache, a bald head, and wrinkles to match. Radius assumes many features of the wise elder he is portrayed as. Tall and thin, he sports a walking cane, white overcoat with black and gold accoutrements, and a white and blue inner-garment with golden features.


Radius is a wise old man who trains Serge in how to fight and using tech spells. As a former Deva, he fights using his staff but the way he fights is like he uses a sword or a katana and utilizes the laido[1] fighting style. Radius shows both his sadness and grief because of the tragedy he caused his friend, and both Dario and Glenn's father, Garai by killing him due to the Masamune's possession when he wields the Masamune. Upon seeing Lynx when he visited his mother from his home, he was initially hostile until he recognized Serge within Lynx, leading him to join the party.


Chrono Cross[]

Born on the Zenan mainland, he made his way into the service of the Dragoons, where he met Zappa, Garai, and General Viper. The sage man demonstrated a fantastic combative skill while in service of the Acacia Dragoons, and soon was promoted to Deva alongside the others. In 1005 A.D., the four warriors tore up the battlefield and established a reputation of ferocity. Sadly, this tenure was disrupted by tragedy when Garai and Radius happened upon the demonic Masamune. Radius was consumed with its power and murdered Garai in a fit of insanity; while the other Dragoons accepted the incident as an accident, it caused Radius to seriously reevaluate his life. Radius buried Garai at the Isle of the Damned and began leading a more spiritual life. Already middle-aged at this time, he retired later in the year 1016 A.D., resigning to Arni to become its chief. There, he sought to establish a kind and knowledgeable leadership; he decorated his chief's hut with wise sayings and other resources and laid down his sword forever. When Dario died after being corrupted by the Masamune, Radius took the Einlanzer and placed it at Garai's grave at the Isle of the Damned.

During his stay at Arni, he counseled the villagers and held seminars on the lawn in front of his hut. He taught Serge how to use basic elements in this manner. His life remained relatively peaceful after Serge crossed the dimensions until Serge returned with the body of Lynx; Radius, suspecting the evil Demi-human himself had come to Arni, called him out for battle. Though Radius was defeated, he detected that Serge's spirit was truly in Lynx's body, and soon conversed concerning his travels. The duo decided that they needed to journey to the Dead Sea; this led them across El Nido and eventually to Death's Door. There, the demonic Masamune blocked passage to the Dead Sea through an evil aura; Radius regretfully noted that the Einlanzer alone could dispel the negative energy. Radius and Serge subsequently journeyed to the Isle of the Damned and attempted to remove the sword; Garai's spirit angrily arrived and challenged them to fight. Radius reluctantly defeated his old friend again and speculated that perhaps Glenn would kill him as penance. Radius then remained with Serge for the rest of his travels, eventually meeting his dimensional equivalent in Another World. When he approached the Frozen Flame, Radius showed weakness in being tempted by a dark power once more but was able to stand against the evil influence.

After defeating the Time Devourer, Radius decided to return to Arni stating that his friends are waiting for him.

Radical Dreamers: Nusumenai Hōseki[]

Radius RD

Radius in Radical Dreamers.

While never mentioned by name, it is conventionally accepted that the Old Man in the Viper Manor Catacombs is Radius. Once a prominent member of the Acacia Dragoons, the Old Man resigns from his rank after Lynx befriends General Viper. Originally, the two forms an alliance to search for the Frozen Flame, but Lynx quickly turns on the General (aided by Radius) and usurps the Manor, kidnaps his daughter, Riddel, and steals the sacred artifact. Mired in grief and self-loathing, Radius is locked in the Manor's Catacombs, where he was occasionally visited by Riddel until he revealed his involvement in the plot against her father. Radius returns deep and amorous respect for Riddel, although she loathes him and wishes him a speedy death. Serge, Kid, and Gil find Radius in the Catacombs. Long imprisoned there, he has clearly gone insane. Gil notes that this insanity is, in fact, a mental shield used to assist Radius in coping with his betrayal and also mentions the only way to reach through to him is with the Dragoon Ring. After learning of the location of Lynx and the backstory of his life, the party bids him farewell. Before leaving, Gil bends the bars of his prison cell to release him. When he does not budge, he exclaims that Radius must walk through the bars himself; an allusion to how Radius ought to recover from his grief.



Main article: Radius (Boss)

After Lynx joins your party and you return from the Dimensional Vortex, visit Opassa Beach (Home World) and use the Astral Amulet to go to Arni Village. Then speak to Serge's mother and Radius will challenge you and join your party after the battle.


  • Balanced Stats
  • Learns a Dual Tech


  • Low HP

Tech Skills[]



In geometry, radius is a term for a line extending from the center of a circle to its border. In anatomy, radius is a bone on the thumb-side of the forearm of humans, the largest vein in the wing of an insect, and a series of vertebrae in fish. The word radius itself came from Latin, meaning “a ray (of light)”.


Playable characters
Serge · Lynx · Kid · Poshul · Leena · Macha · Korcha · See more...
Non-playable characters
Ash · Belcha · Belthasar · Chief Direa · Dario · Doreen · Dragon God · Dwarf Chieftain · Entity · FATE · Fortune Teller · Garai · Ghetz · Ghost Children · Gogh · Kiki · Lisa · Lucca · Marge · Masa & Mune · Mermaid · Old Fisherman · Poet · Prometheus Circut · Rosetta · Sage of Marbule · Schala · Shaker Brothers · Skelly's Grandmother · Stablekeeper · Statue Cleaner · Tia · Toma XIV · Wazuki · Witch Doctor · Una · Zippa · Zelbess
Another World · Bend of Time · Darkness Beyond Time · Home World
El Nido Archipelago
Arni · Cape Howl · Chronopolis · Dead Sea · Death's Door · Divine Dragon Falls · Dragon King Palace · Earth Dragon Isle · El Nido Triangle · Fossil Valley · Forbidden Island · Fort Dragonia · Gaea's Navel · Grand Slam · Guldove · Hermit's Hideaway · Hydra Marshes · Isle of the Damned · Lizard Rock · Lucca's House · Marbule · Mount Pyre · Nadia's Bell · Opassa Beach · Pearly Gates · Porre · S.S. Invincible · S.S. Zelbess · Sea of Eden · Shadow Forest · Sky Dragon Isle · Smithy · Temporal Vortex · Termina · Terra Tower · Viper Manor · Viper Manor Bluffs · Water Dragon Isle
Key Terms
Tech · Element · Innate · Record of Fate · Demi-human · Acacia Dragoons · Time Egg · Frozen Flame
Enemies · Weapons · Elements · Items
Playable Characters
Serge - Kid - Gil
Non-playable characters
Lynx - Riddel - General Viper - Vera - Zorander - Grismeld -

Merkid - Lucca - Schala - Serge's Grandchild - Radius - Noella - Pollen - Siren - Shea

Viper Manor
Terrace - Study - Ballroom - Armory - Catacombs - Riddel's Room - Lynx's Quarters - Kitchenette - Atrium - Torture Room - Gear Room - Treasure Room - Dark Forest - Zeal Ruins
Goblin - Skeleton - Feral Cat - Piranha - Gryphon - Demonic Warlock - Poltergheist - Devil Circle - Lilith
Potion - Treasure Room Key - Catacombs Key - Gold Crown -

Frozen Flame - Einlanzer - Dragoon Ring - Chrono Trigger

Key Terms
Mouth of Truth - Music Box - Mirror of Whispers - Golden Beetle - Acacia Dragoons