Silver Sword of the Astral Plane
The Silver Sword of the Astral Plane is a legendary +3 greatsword in Baldur's Gate 3, with extra psionic damage, the Soulbreaker weapon action, and especially strong benefits for Githyanki characters.
Key Takeaways
The Silver Sword of the Astral Plane is a legendary +3 greatsword whose strongest benefits are tied to Githyanki identity and its unique Soulbreaker weapon action. Its early acquisition is possible, but it involves a major story encounter and can affect how that encounter unfolds.
Legendary greatsword with psychic damage
As a +3 greatsword, the Silver Sword combines its slashing weapon damage with an additional psychic-damage component. Its Two-Handed and Martial properties make proficiency and a suitable melee setup important.
Its defining feature is Soulbreaker
Soulbreaker gives the weapon a distinctive control option against humanoid targets, adding a capability that ordinary greatswords do not provide. The action belongs to the weapon and should be evaluated separately from its normal attacks.
Githyanki gain the full package
The sword grants powerful additional benefits to a Githyanki wielder, including its bonus psychic-damage effect and defensive advantages. A non-Githyanki character can still use the greatsword, but does not receive the weapon's complete identity-specific package.
An early pickup is possible, but not routine
During Act 1, players can attempt to make Kith'rak Voss drop the sword using effects such as Command: Drop or Disarming Attack. This is a major-spoiler acquisition route rather than the weapon's normal late-game progression path, and Voss may not carry this version when encountered later.
The main limitation is commitment to a greatsword role
The weapon occupies a two-handed melee slot and depends on Martial Weapon Proficiency for reliable use. Its strongest bonuses also favour Githyanki characters, so a character built around shields, finesse weapons, ranged attacks or non-Githyanki item synergies may value a different weapon more highly.
Its comparison is about effects, not only enchantment
Against other high-end greatswords, the Silver Sword stands out through Soulbreaker, psychic damage and Githyanki-specific bonuses. A comparison with weapons such as Balduran's Giantslayer therefore depends on the character and desired effects, not simply on the shared greatsword category.
Overview
The Silver Sword of the Astral Plane is a legendary greatsword in Baldur's Gate 3, combining endgame-grade enchantment with a weapon action and bonuses that particularly reward Githyanki characters.
This weapon is built for a character who wants a heavy two-handed melee role without giving up a distinctive magical identity. Its defining feature is not merely its greatsword damage profile, but the combination of the Soulbreaker weapon action and additional benefits tied to Githyanki wielders. That makes it especially relevant to Lae'zel and to player characters using a Githyanki martial build, while still leaving it usable by other proficient characters.
Soulbreaker gives the sword a form of control that ordinary greatswords do not provide, adding tactical value to a weapon normally chosen for sustained melee attacks. The Githyanki-specific bonuses further broaden its role by improving the wielder's resilience and combat performance against threats associated with psychic effects and mental saving throws. These benefits should be treated as conditional identity features rather than universal advantages: the sword remains powerful outside a Githyanki build, but its complete package is ancestry-sensitive.
In the normal progression of Baldur's Gate 3, the Silver Sword of the Astral Plane is associated with the later stages of the story and represents a major upgrade in a martial character's equipment. An unusual early-acquisition opportunity can arise when Kith'rak Voss is encountered in Act 1, allowing players to obtain the sword by disarming him rather than waiting for its later story context. That route is a major progression shortcut and may affect how the weapon fits into the rest of a playthrough, so it should not be confused with its intended late-game place in the narrative.
Compared with a conventional greatsword or a lower-enchantment named weapon, this sword offers a more specialized trade-off: its value comes from the interaction between high enchantment, control, psychic-themed effects, and Githyanki synergy. It is therefore a natural centerpiece for Lae'zel or another Githyanki frontline character, while a non-Githyanki wielder may prefer an alternative whose passive effects match a different class, ancestry, or damage plan. The item is part of the base Baldur's Gate 3 equipment pool rather than a separate DLC variant.
Statistics
This game publishes dice damage rather than 0–100 bars, so the verified damage, enchantment, weight and value are listed instead. Taken from the project's verified weapons database, not from generated text.
- Base Damage2d6+3
- Damage TypeSlashing
- Enchantment+3
- RarityLegendary
- Weight2.7 kg
- Value1300 gp
- Entry TypeNamed / special
Figures verified against Consolidated Game Weapons Database.
Compared to similar slashing weapons
| Weapon | Base Damage | Damage Type | Enchantment | Weight | Value |
|---|---|---|---|---|---|
| Silver Sword of the Astral Plane | 2d6+3 | Slashing | +3 | 2.7 kg | 1300 gp |
| Everburn Blade | 2d6 | Slashing | — | 2.7 kg | 130 gp |
| Sorrow | 1d10+1 | Slashing | +1 | 2.7 kg | 380 gp |
| Balduran's Giantslayer | 2d6+3 | Slashing | +3 | 2.7 kg | 1300 gp |
| Drakethroat Glaive | 1d10+2 | Slashing | +2 | 2.7 kg | 960 gp |
Damage is the dice expression; weight and value are the game’s own figures. From Consolidated Game Weapons Database.
How to Obtain
- The Act 1 route requires access to the Mountain Pass and a successful disarm effect; Command: Drop requires a character able to cast that spell, while Disarming Attack requires a Battle Master with the manoeuvre available.
- The later route requires reaching Act 3 and accepting Kith'rak Voss's plan concerning Orpheus. Major story choices can affect whether this reward route remains available.
- The Act 1 sword theft is a conditional encounter outcome rather than a guaranteed drop, and the weapon is limited to the single copy obtained from this encounter or the later story reward.
- 01[Major spoiler] In Act 1, travel through the Mountain Pass to the road and bridge outside Rosymorn Monastery. Kith'rak Voss appears there with a red dragon during the Githyanki confrontation; save before starting the encounter because the early method depends on a successful disarm.
- 02During the confrontation, target Kith'rak Voss with Command: Drop or a Battle Master fighter's Disarming Attack, then retrieve the Silver Sword of the Astral Plane from the ground before the encounter ends. Neither tactic guarantees success, so reload if the disarm fails or the sword is not dropped.
- 03Alternatively, continue the githyanki storyline into Act 3 and follow Kith'rak Voss's request to oppose Vlaakith and free Orpheus. If the relevant agreement and quest conditions are met, Voss can provide the sword later; this route avoids relying on the Act 1 disarm but requires the later story decision.
Availability
Requires Kith'rak Voss must be present during the patrol sequence. The sword can be obtained if he is forced to drop it, including through a successful Command: Drop or Disarming Attack interaction.
This is an optional early acquisition rather than the weapon's normal progression point. The outcome depends on the encounter's combat state and can be missed.
Requires Keep Kith'rak Voss available and follow the Githyanki–Orpheus storyline far enough to reach his later reward or handover opportunity.
The later route avoids relying on the Act 1 disarm, but the exact opportunity is tied to story choices and is not vendor stock. No fixed purchase price applies.
Mechanics and Handling
The Silver Sword of the Astral Plane is a greatsword, so its ordinary handling is built around committed two-handed swings rather than rapid, low-cost attacks. Its reach and heavy slashing pattern make spacing important: it is most comfortable when the wielder can stay in melee range long enough to complete attacks, but less convenient when enemies frequently disengage or force repositioning. As with other greatswords, its damage dice remain separate from the weapon’s additional psychic damage effects rather than being treated as one undifferentiated damage value.
The sword’s defining mechanical distinction is its interaction with Githyanki characters. A Githyanki wielder receives the weapon’s additional psychic benefits, while a non-Githyanki wielder does not gain the full value of those conditional effects. This makes the weapon especially natural for Lae’zel or a Githyanki player character, although the underlying greatsword remains usable by another proficient wielder. The conditional bonuses should therefore be read as part of the weapon’s handling profile, not as universal properties that every wielder receives.
Soulbreaker and the weapon’s control role
Soulbreaker is the sword’s signature weapon action. On a successful use, it can inflict the Stunned condition on its target, giving the weapon a control function in addition to its high-end melee damage. The effect is conditional rather than guaranteed, so it should not be treated as a permanent stun lock or as a replacement for reliable crowd-control spells. Its value is highest when used against a dangerous target whose turn can be meaningfully disrupted, particularly after the party has considered the target’s relevant saving-throw defenses.
The action also changes how the sword is best used in a fight. A wielder does not need to spend every turn on ordinary attacks when a priority enemy is threatening the party; Soulbreaker creates an opportunity to trade some immediate damage focus for a chance to remove that enemy’s turn. Because the action is tied to this specific weapon, its availability is a meaningful reason to keep the sword equipped rather than treating it only as an interchangeable +3 greatsword.
Psychic effects and Githyanki handling
The sword adds psychic damage to its attacks, and its Githyanki-specific effects further reinforce that damage profile. For a Githyanki wielder, the weapon also provides defensive and saving-throw benefits associated with its astral theme, including protection against psychic threats and improved resilience in mental contests. These effects are conditional on the wielder’s race and should not be copied into a universal weapon summary for every character.
That distinction matters in party planning. On Lae’zel or a Githyanki protagonist, the sword combines a two-handed melee moveset, psychic damage, a chance to Stun, and defensive utility in one item. On a non-Githyanki character, its basic greatsword function and weapon action still matter, but the conditional package is reduced. The sword is consequently more than a raw damage upgrade for its intended wielder, while remaining less uniquely efficient when removed from that context.
Positioning and attack selection
The sword rewards a front-line position with a clear priority target. Use ordinary greatsword attacks when the enemy is already exposed and the party wants dependable damage; reserve Soulbreaker for a target whose next action is more dangerous than the opportunity cost of attempting the stun. The weapon’s psychic additions are damage riders, so resistance or immunity to psychic damage can reduce the value of part of its package without changing the underlying slashing attacks.
Its two-handed format also limits flexibility compared with a one-handed weapon and shield setup. The wielder gives up the defensive and item-slot options associated with a shield in exchange for heavier attacks and access to the greatsword’s weapon handling. That trade is most persuasive for a character already committed to melee reach, martial proficiency, and a front-line role.
Strengths, Weaknesses and Best Uses
Strengths
- As a legendary +3 greatsword, the Silver Sword of the Astral Plane combines a strong two-handed melee profile with an additional 1d6 psionic damage rider, giving its ordinary attacks a meaningful damage advantage without relying on a temporary buff.
- Its Githyanki-specific bonuses make it especially valuable for a character such as Lae'zel: the wielder gains powerful defensive and saving-throw benefits in addition to the weapon's offensive effects.
- Soulbreaker gives the weapon a distinctive control option beyond its normal attacks, allowing a suitably positioned melee user to apply pressure through a weapon action rather than relying only on damage.
Weaknesses
- The sword is a greatsword, so equipping it commits the character to a two-handed melee setup and prevents simultaneous shield or off-hand weapon use.
- Its most valuable special benefits are tied to a Githyanki wielder. A non-Githyanki character can still use the weapon, but does not receive the same full package of bonuses.
- The weapon's value depends on staying in melee range to make attacks and use Soulbreaker. Characters built around ranged attacks, spellcasting, or frequent weapon switching gain less from it than a dedicated frontliner.
Best uses
- Use it on Lae'zel or another Githyanki martial character whose normal turn is built around repeated greatsword attacks and who can exploit the weapon's defensive bonuses.
- Choose it for a front-line character who wants both reliable weapon damage and a weapon-specific control option, rather than a purely passive damage increase.
- An early acquisition can create a substantial power spike for a Githyanki melee character, but that route involves obtaining the sword from Kith'rak Voss before its intended late-game context and may be less practical than waiting for normal progression.
Compared With Similar Weapons
| Weapon | Class and enchantment | Damage/effect profile | Distinctive properties | Best fit |
|---|---|---|---|---|
| Silver Sword of the Astral Plane | 2d6 slashing plus additional psychic damage | Soulbreaker; powerful bonuses while wielded by a Githyanki | Githyanki characters, especially a late-game two-handed martial build | — |
| Balduran's Giantslayer | 2d6 slashing | Increases the benefit of the wielder's Strength and is especially effective against larger creatures | Strength-based characters seeking a broadly powerful greatsword without a Githyanki condition | — |
| Sword of Chaos | Slashing damage with an additional necrotic damage effect | Restores hit points when its additional effect activates | Front-line characters who value sustain over the Silver Sword's Githyanki-focused bonuses | — |
| Everburn Blade | Slashing damage plus fire damage | Adds fire damage without requiring a separate weapon coating | Early-game two-handed characters; it is a strong interim weapon but lacks the later weapons' enchantment and unique effects | — |
Used In
- Kith'rak VossKith'rak Voss carries the Silver Sword of the Astral Plane during the early Githyanki patrol encounter. The sword can be obtained early by disarming him, rather than through a conventional boss drop.
- The Githyanki WarriorThis Lae'zel companion quest is connected to the Githyanki storyline and the encounters involving Kith'rak Voss, including the early opportunity to acquire the sword.
- Mountain PassThe Githyanki patrol encounter with Kith'rak Voss occurs in the Mountain Pass route, providing the early acquisition opportunity for the Silver Sword of the Astral Plane.
Lore and Design
[Major spoilers] The Silver Sword of the Astral Plane is closely associated with the Githyanki and their struggle against mind flayers. In the game, Kith'rak Voss is the notable character connected with the weapon: he carries it during an early encounter, making the sword part of the Githyanki political and military context rather than an ordinary piece of equipment.
Its identity also reflects the Githyanki’s connection to the Astral Plane. That association is reinforced by the weapon’s name and by its special benefits for Githyanki wielders, although those mechanics should not be treated as proof of an unstated creator intention or broader lore relationship. The sword is especially significant for Githyanki characters such as Lae'zel because it links a powerful combat reward with her people’s story and the campaign’s anti-illithid conflict.
The sword’s unusual availability reinforces its narrative role. Although it is framed as a legendary late-game weapon, an early encounter with Voss can create an opportunity to take it from him. That possibility is a gameplay interaction rather than evidence that the story canonically places the sword in the player’s hands at that point. No separate documented design commentary or real-world inspiration is established for this weapon here.
Trivia
- The sword’s most unusual acquisition trivia is that its legendary form can appear in Act 1 before the story’s intended late-game reward route, if Kith’rak Voss is disarmed during the encounter at the mountain pass. This creates an early version of an item otherwise associated with the Githyanki’s later storyline.
- Kith’rak Voss’s equipment can differ depending on when he is encountered. After the Act 1 opportunity has passed, he may no longer be carrying the same legendary sword, so the weapon’s appearance in his inventory is not consistent across every stage of the story.