Shadow

Shadow (シャドウ) is the Summon Spirit of Darkness. Shadow has appeared in several games of the series as a character or cameo and can be summoned through the Shadow arte. Shadow is opposed by Luna, Aska, and Rem, the Summon Spirits of Light. In Tales of Rebirth, Shadow is replaced by Eephon, the Sacred Beast of Darkness.

Appearances
Shadow is the Summon Spirit of Darkness. He has no set form, either taking the appearance of near-figureless darkness or a warrior clad in dark, imposing armor.

Tales of Phantasia
Shadow appears as a ghost-like spirit. Found in the Cave of Shadows, he is the Dark Spirit, only agreeing to help the party because dark creatures, his friends, have been brainwashed into helping Dhaos. Shadow requires the Amethyst Ring to forge a pact, granting Claus F. Lester with the power to summon him in battle though the Shadow arte.

Tales of Phantasia: Narikiri Dungeon
Shadow is the Spirit of Dark and one of the twelve Spirits which must be fought during the Ordeal of Spirits. He appears on the last level of the Cave of Darkness in AC.4354 and is the boss of that dungeon. Once defeated, he teaches Mel and Dio about balance.

Tales of the World: Summoner's Lineage
Fulein F. Lester can summon Shadow as a unit.

Tales of Eternia
Shadow represents one of the Greater Craymels and is the Governing Craymel of Celestia with dominion over Gnome, Volt, and Celsius. The Dark Craymel governs the use of all dark element spells. Shadow first appears when the party finished acquiring the Primary Craymels under his control, congratulating them and granting the party the Excalibur sword. A proud being, he is found in the Shadow Cave, and tests the party's will. Finding them acceptable, he joins them. Shadow can be summoned through the arte Shadow.

In battle, Shadow is aided by two Empty Dolls. He wields his double-bladed sword by swinging it in large arcs or thrusting it. He can also spin in front of him, which is the basis of his Dash Counter (ダッシュカウンター) arte, where he spins his blade in front of him in response to a charging enemy. He also has Shadow Thrust (シャドウスラスト) where he dashes forward which thrusting, and he can cast dark-elemental spells such as Dark Force and Summon Demon (サモンデーモン), which calls a demon to cast infernal fire in front of him. He also has a rare counter move called Banishment (バニッシュメント) in which he knocks his opponent into the air with dark spires before piercing him with lances of energy.

Tales of Destiny 2
Shadow is a cameo appearance in the Hi Ougi arte Luna Shade (ルナシェイド).

Tales of Symphonia
Shadow, the Envoy from the Dark Abyss, appears as a vaguely humanoid shape made of a dark substance (presumably shadow itself) and must be found and rejoined. He is one of the Tethe'allan Summon Spirits and does not use full sentences when speaking. Found south of the Fooji Mountains in the Temple of Darkness, he is the Summon Spirit of Darkness. He can be summoned through the arte Summon: Darkness (降霊召符・闇),

In battle, Shadow attacks mainly through the agency of his limbs, which he can transform into various weapons such as axes or swords. He also has access to Dark Shower (闇沙雨), a variation of Sword Rain in which he turns his limbs into piercing lances and thrusts forward, following by slamming his hand down. Shadow can cast the few dark-elemental spells which exist in the game, Dark Sphere and Bloody Lance.

Tales of Symphonia: Dawn of the New World
Though Shadow doesn't appear in the game, his home in the Temple of Darkness is where the Centurion of Darkness's, Tenebrae's, core is found. In reference to his position as the Summon Spirit of Darkness, his name is attached to monster grimoires which teach darkness elemental artes: Shadow's Language, which teaches Scare Shot and Shadow's Walk, which teaches Negative Gate.

Tales of Legendia
Shadow appears as a glowing ball of light only Grune can see, joining her after the party defeats the Dark Norma Beatty. He then rests in Grune's urn as a seed, at which point Grune plants it in the Village of the Ferines.

At the end of the game, Shadow is born from this seed as one of the Summon Spirits bequeathed onto the world. Given his nature in other games, he probably represents the Curse element, which consists of spells associated with the Darkness element in other games.

Tales of the Abyss
Shadow is the aggregate sentience of the First Fonon, the Fonon of Darkness. His name used to represent the sixth and seventh months, Shadow Decan and Shadow Redecan.