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Crystals (結晶, Kesshō?) were a consumable item in Sword Art Online. They were considered to be one of the most convenient types of items and the closest thing to magic in Aincrad. Crystals are divided into multiple, colour-coded types based on their effects. The common trait of all crystals is that they take immediate effect upon being consumed, rather than applying their effect over a certain period of time. Crystals can be used for healing, curing debuffs, teleportation of individuals, opening short-cut corridors to a specified location for a group of players, and displaying images or replaying voice messages. As a downside to their extreme usefulness, all crystals are more or less rare and expensive commodities, which results in players being hesitant to use them outside of emergencies.

Appearance

Crystals look like eight-sided pillars[1] of various colours.

Acquisition

Most crystals can be obtained through certain NPC shops or monster drops, except for the Corridor Crystal. Corridor Crystals are the rarest of all crystals, obtainable only through trading with other players, from killing monsters, or by finding them in a treasure chest.[citation needed]

Crystals debut in the Drop pool for all monsters starting from the 6th Floor. According to Kirito's empirical observations, the drop rate for crystals on the 6th Floor is about 0.01%, increasing tenfold to 0.1% on the 7th Floor.[2]

Known Types

Image Type Japanese Colour Description
Corridor Crystal.png Corridor Crystal 回廊結晶(コリドークリスタル)
(Koridō Kurisutaru)
Indigo[3] Opens a shortcut gateway to any location that the player has marked.
Antidote crystal.png Curing Crystal 治癒結晶
(Chiyu Kesshō)[3]
Green[3] Cures the user from poison.
Healing Crystal 回復結晶(ヒーリング・クリスタル)
(Hīringu Kurisutaru)
Rose Pink[2] Completely heals the target.
Record Crystal.png Message Recording Crystal メッセージ録音クリスタル
(Messēji Rokuon Kurisutaru)
Records what someone has said.[citation needed]
Teleport crystal.png Teleport Crystal 転移結晶(テレポ-ト・クリスタル)
(Terepōto Kurisutaru)
Blue[3] Transports the user to a chosen main town's Teleport Gate plaza.

Activation

In general crystals can be activated through either one of two methods. The first method is to physically tap on the crystal and select the Use (使用, Shiyou?) button from a pop-up window. Alternatively, the player may activate the crystals through voice commands while holding the crystal in one of their hands. When the user desires to use the crystal on another player, they must physically touch the player with their other hand when activating the crystal; otherwise, the effects of the crystal are applied to the user themselves by default.[2]

Voice Commands
Type English Japanese
Corridor Crystal Corridor Open コリドー・オープン
(Koridō Ōpun)
Healing Crystal Heal ヒール
(Hīru)
Teleport Crystal Teleport, [Target Location Name] 転移、[Target Location Name]
(Ten'i, [Target Location Name])

Conditions Preventing Usage

Crystals can be rendered unusable by anti-crystal fields, encountered either as traps in dungeons or as a feature of boss rooms starting from the 74th Floor. Additionally, since the crystals are primarily used through voice commands, Silencing debuffs afflicted by certain monsters may also render players unable to use their crystals.

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SAO Weapons Anneal Blade - Dark Repulser - Ebon Dagger - Elucidator - Guilty Thorn - Karakurenai - Lambent Light - Liberator - Mate Chopper - Stout Brand - Sword Breaker - Throwing Pick - Tyrant Dragon - Wind Fleuret
Argyro's Sheet - Blackwyrm Coat - Coat of Midnight - Cor - Crystal Bottle of Kales'Oh - Crystallite Ingot - Crystals - Divine Stone of Returning Soul - Dusk Lizard Hide - Eternal Storage Trinket - Hand Mirror - Mighty Strap of Leather - Mirage Sphere - Pneuma Flower - Potions - Ragout Rabbit's Meat - Ring of Agility - Ring of Angel's Whisper - Scavenge Toad Meat - Tremble Shortcake - Vendor's Carpet - Yui's Heart
ALO Black Iron Great Sword - Blue Long Sword - Crest of Yggdrasil - Demonic Sword Gram - Holy Sword Excalibur - Lightning Hammer Mjölnir - Long Sword - Sap of the World Tree - Yrd
GGO Accuracy International L115A3 - Credit - Defense Field - FN Five-Seven - GE M134 Minigun - Kagemitsu G4 - Metamaterial Optical Camouflage Mantle - PGM Ultima Ratio Hecate II - Plasma Grenade - Procyon SL - Satellite Scan Terminal - Starship Metal Estoc - Type 54 "Black Star"
Project Alicization Black Lily Sword - Blue Rose Sword - Conflagrant Flame Bow - Divine Object - Dragon Bone Axe - Fragrant Olive Sword - Frost Scale Whip - Gigas Cedar - Goblin Sword - Heaven Piercing Sword - Night Sky Sword - Silvery Eternity - Time Piercing Sword - Twin Edged Wings
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