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11 Echoes of Aincrad is a single-player game, but the player never fights alone. From early in the campaign, an NPC companion is always at the hero's side, contributing damage, healing, or crowd-control and participating in the combat system's team-up attacks.
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33 The Confirmed Roster
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55 CompanionWeaponRoleIoriSword and ShieldHealer, places healing circles on the ground.WyzemanHeavy blunt weapon (listed as mace)Tank, controls engagements with weight.ZashTwo-handed SwordDamage and support, with attack buffs and barriers.ArgoDaggerFast striker; returning SAO character and in-world information broker.
66 Role in Combat
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88 The companion is what turns a successful Parry Slash or Dodge Slash from a counter-attack into a paired strike. They also participate in Reversal Slash when the player reads an enemy opening correctly.
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1111 Support and Attack Modes
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1313 Companions can switch between a support mode, in which they stay close to the player and contribute utility, and an attack mode, in which they cut loose with their full combat kit for a limited time. Managing when to trigger attack mode is a key tactical decision, since it gives the party a significant damage spike but cannot be kept up indefinitely.
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1515 Bonds
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1717 Each companion has their own set of skills and their own synergies. Bandai Namco has described the relationship as a bond that deepens over the course of the campaign, unlocking stronger team abilities as the player and companion fight together.
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2020 Party Size and Selecting a Partner
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2222 Throughout most of the campaign your active party consists of you plus a single partner character. During sections involving guest characters the party temporarily grows to three, and in the large-scale battle shows the party can reach even larger numbers, although the developers have not yet confirmed a hard cap for those set-piece encounters.
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2424 Before leaving town on an expedition you choose one partner to take with you from the Main Terminal or your party menu. During the reveal gameplay the selectable partners were Iori, Wyzeman, and Argo, while Zash was showcased separately in a later developer stream. The four confirmed partners each use a distinct weapon type so that their combat style feels different from yours and from each other.
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2626 Partner Weapon Loadouts
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2828 Iori fights with a one-handed sword. Wyzeman wields a mace as his primary blunt weapon. Argo uses a dagger for quick-striking melee. Zash carries a two-handed sword that trades speed for sweeping reach. Because each partner has a fixed weapon category, swapping who you bring on an expedition meaningfully changes how your team approaches crowds, bosses, and narrow corridors.
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3030 Support Skills and Combination Skills
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3232 Every partner brings two slotted abilities into combat: a Support Skill that gives the party an exploration or combat utility on its own, and a Combination Skill that is a tag-team ultimate the two of you activate together. Holding the action-shift button surfaces the partner's Support Skill and Combination Skill alongside the sword-skill shortcuts already bound to the face buttons, so you can trigger a teammate ability from the same menu you use to fire off your own sword skills.
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3535 Iori's Healing Circle Support Skill places a zone on the ground that steadily restores HP to any party member standing inside it, which pairs well with her role as the most balanced front-line partner. Wyzeman's Discordant Resonance Support Skill pulses damage into nearby enemies and applies a stacking buildup that gets heavier the longer foes linger in range. Argo's Analysis Support Skill briefly reveals the location of nearby treasure chests and enemies. This shows pings through walls and making her invaluable for clearing new dungeon floors or locating hidden rewards. Zash's Support Skill layers an additional shield on top of your health bar, giving the whole party a safety buffer before incoming damage eats into raw HP.
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3737 Combination Skills differ in focus from partner to partner in the same way that Support Skills do. Zash's Combination Skill in particular emphasizes area-of-effect output and is especially effective when you are surrounded, turning an otherwise dangerous encirclement into a cleanup opportunity. Pairing a partner whose Combination Skill matches the threat in front of you, mobile bosses, dense mobs, or a tight chokepoint, is a core part of expedition planning.
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3939 Partner Summary
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4141 PartnerWeaponSupport SkillCombination Skill FocusIoriOne-handed swordHealing Circle, zone that restores HP to allies standing in itSustained party healing and front-line recoveryWyzemanMaceDiscordant Resonance, damages nearby enemies with stacking buildupCrowd pressure and status buildup on grouped foesArgoDaggerAnalysis, reveals chests and enemies through walls for a timeBurst single-target strikes and reconnaissanceZashTwo-handed swordShield layer added on top of the player's HP barArea-of-effect damage, strongest when surrounded
4242 Customization and Deepening Bonds
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4444 Partners can be equipped with their own weapons and given customization options separate from your own loadout, so you can tune each companion toward a specific role. As your bond with a partner grows the partner unlocks new skills and stronger abilities, which ties directly into partner-focused side stories and extra scenes that play out between expeditions. Investing in one partner therefore pays off both mechanically, through a wider skill set, and narratively, through side content that explores their personality and past.
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4646 There are no dating or likability ratings in this entry, which differs from some prior Sword Art Online titles. Series producer Yosuke Futami has said that because the story is set during the introduction to the death game, a romance progression system would not fit the tone, so companion affinity expresses itself through combat synergy and side stories instead of a relationship meter.
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4848 Each partner has their own dedicated side quests that expand on their personality and backstory. These optional missions sit alongside the main story, give you concentrated one-on-one time with a single companion, and typically unlock new Support Skill or Combination Skill upgrades when completed.
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5050 Combat Behavior: Free Mode and Switch Mode
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5252 Partner combat behavior toggles between two stances during a fight. Free Mode turns the partner loose to auto-attack nearby enemies, which is the better setting when you are surrounded and need sustained output from both characters at once. Switch Mode is the defensive stance: the partner hangs back and swaps in to strike the moment you land a well-timed evade, converting your defensive read into a guaranteed partner hit. Flipping between these two modes on the fly is a core part of the combat system, and the tag-team counters it produces flow directly into Parry Slash, Dodge Slash, and Reversal Slash. See the Switch System article for the full breakdown of how partner switches resolve and what they cost.