Balduran's Giantslayer
Balduran's Giantslayer is a legendary +3 greatsword in Baldur's Gate 3, built for Strength-focused melee characters and especially effective against Large, Huge, and Gargantuan enemies.
Key Takeaways
Balduran's Giantslayer is an Act 3 legendary greatsword built around Strength and exceptional performance against massive enemies. Its value comes from a combination of enchantment, Strength-based damage, size-focused advantages, and a transformation action rather than from its damage die alone.
Legendary +3 greatsword
The weapon is a legendary +3 greatsword, making its enchantment bonus part of its baseline identity rather than a separate temporary enhancement.
Strength rewards committed melee users
Its Giantslayer passive doubles the damage bonus from the wielder's Strength modifier on a successful hit, giving the clearest benefit to Strength-focused melee characters.
Built to challenge large enemies
The sword grants advantage on attack rolls against Large, Huge, and Gargantuan creatures, while its Topple the Big Folk weapon action adds another tool for fighting oversized targets.
Giant Form changes the combat profile
Giant Form is a class action granted by the weapon. It increases the user's size, provides temporary hit points, and adds extra damage to weapon attacks, making it a significant active component of the weapon's kit.
Act 3 acquisition is encounter-gated
Players obtain Balduran's Giantslayer by completing the Wyrmway trials and defeating Ansur in the Dragon's Sanctum, so it is an endgame acquisition rather than an early progression option.
Its main limitation is role commitment
As a two-handed greatsword whose signature passive depends on Strength, it is less naturally suited to characters built around Dexterity, ranged attacks, or spellcasting than to a proficient Strength-based melee user.
Overview
Balduran's Giantslayer is a legendary greatsword in Baldur's Gate 3, built around Strength-based melee combat and enhanced performance against Large, Huge, and Gargantuan enemies. Its defining package combines a Strength-scaling passive, Giant Form, and a specialized weapon action.
Balduran's Giantslayer is a late-game legendary greatsword rather than a routine upgrade in a weapon family. Its identity comes from combining the normal role of a two-handed greatsword with effects aimed at powerful, oversized enemies: the wielder has advantage on attack rolls against Large, Huge, or Gargantuan targets, while the sword also grants the Topple the Big Folk weapon action. This makes its value depend on both the character using it and the encounters ahead.
The weapon's central passive doubles the damage bonus supplied by the wielder's Strength modifier on a successful hit. That effect gives the sword a particularly direct relationship with Strength-focused melee characters, while avoiding the implication that every character receives the same benefit from it. It is therefore distinct from a greatsword chosen only for its enchantment or base damage: its payoff increases when the wielder is built to attack with Strength and when the encounter provides suitable targets.
Balduran's Giantslayer also grants Giant Form as a class action. The action increases the user's size, provides temporary hit points, and adds extra damage to weapon attacks. These effects give the sword a temporary combat mode in addition to its persistent bonuses, so it is more than a passive numerical improvement. Giant Form is especially relevant when a player wants the weapon to support a decisive melee turn, although the exact value of that choice depends on the character's other actions, resources, and equipment.
[Major spoiler] The sword belongs to Baldur's Gate 3's Act 3 progression and is obtained through the Wyrmway sequence, culminating in a confrontation with the dragon Ansur in the Dragon's Sanctum. Its historical association with Balduran and its presence alongside the Helm of Balduran give the reward broader narrative significance than an ordinary endgame weapon. In practical terms, it is a late-game choice for Strength-based greatsword users and for parties that expect to face large high-priority enemies, rather than a universal replacement for every melee setup.
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 |
|---|---|---|---|---|---|
| Balduran's Giantslayer | 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 |
| Silver Sword of the Astral Plane | 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
- Baldur's Gate 3 Act 3 and access to Wyrm's Rock Prison.
- A way to deal Lightning damage to the two dragon-head torches that conceal the Wyrmway entrance.
- Completion of the four Wyrmway trials before entering the Dragon's Sanctum.
- Defeat of Ansur; the weapon cannot be collected before this boss encounter.
- 01[Major spoiler] In Act 3, reach Wyrm's Rock Prison beneath Wyrm's Rock Fortress. The entrance to the Wyrmway is hidden at the prison's western dead end; strike the two dragon-head torches beside the sealed passage with Lightning damage to open the way. This is an optional route rather than a vendor or purchase.
- 02Enter the Wyrmway and complete its four trials: the Chamber of Justice, Chamber of Insight, Chamber of Strategy, and Chamber of Courage. Completing these trials opens the route to the Dragon's Sanctum, where the related quest The Legend of Ansur continues. The trials are required to reach the weapon's source.
- 03Defeat Ansur in the Dragon's Sanctum and loot his remains afterward. Balduran's Giantslayer is a guaranteed reward from this encounter. The weapon is a unique Act 3 item, so the optional Wyrmway route and the Ansur fight are missable if you leave the act without completing them; there is no vendor or alternate recovery route. You can obtain only one copy in a normal playthrough.
Availability
Requires Reach the Wyrmway in Act 3, complete its trials, and defeat Ansur.
Major story spoiler. Balduran's Giantslayer is obtained from the Ansur encounter rather than ordinary vendor stock; wielding it also requires greatsword proficiency.
Mechanics and Handling
Balduran's Giantslayer handles like a conventional two-handed greatsword, so its ordinary attacks are committed close-range swings rather than attacks with extended reach or a separate ranged mode. Its defining handling advantage is not an unusual basic animation: the weapon turns Strength investment and target size into more reliable offensive pressure. The sword's passive doubles the damage contribution from the wielder's Strength modifier on a successful hit, while its advantage against Large, Huge, and Gargantuan enemies makes it especially dependable when fighting oversized targets.
That size-based advantage is conditional rather than a universal increase to every attack. Against creatures outside those size categories, the weapon still benefits from its legendary enchantment and Strength-focused passive, but the advantage effect does not apply. This makes Giantslayer particularly suited to a front-line character who already attacks with Strength and can stay in melee, rather than a weapon whose main value comes from finesse, reach, or ranged flexibility.
Strength-based greatsword handling
The sword's normal attacks use the close-range, two-handed greatsword pattern. It does not add a separate reach rule or a projectile mode, so positioning remains important: the wielder must be within melee range and should avoid spending movement in a way that leaves the character unable to capitalize on the weapon's attack advantage. The weapon's passive rewards direct weapon hits, making Strength-based melee attacks the clearest way to use its special properties.
Balduran's Giantslayer also grants the weapon action Topple the Big Folk. This is a distinct control option from the ordinary attack sequence: it can attempt to knock a target Prone, giving the wielder a way to trade some immediate attack pressure for disruption when prone status would help the party's next actions. Its name and targeting role make it most relevant against the large creatures that the sword otherwise already favors, but the action should not be treated as an automatic knockdown.
Giant Form
The weapon grants the Giant Form class action. Activating it changes the wielder into a giant-sized combatant, grants temporary hit points, and adds extra damage to weapon attacks. It also improves the character's Strength checks and Strength saving throws, so the effect supports both durability and the Strength-based attack pattern that makes Giantslayer distinctive.
Giant Form is a temporary combat state, not a permanent alteration to the weapon's base damage or a replacement for its ordinary moveset. The additional attack damage therefore belongs to the active form's conditional benefits and should be kept separate from the sword's regular enchantment, Strength passive, and other effects supplied by the character's build. Once the temporary benefits are no longer active, the wielder returns to the weapon's normal handling and passive effects.
Practical target selection
The sword's strongest built-in matchup is a Large, Huge, or Gargantuan enemy: Giantslayer supplies advantage on attack rolls against those targets, its name-specific control action is relevant to them, and Giant Form helps a Strength-based front-liner remain effective while trading blows. Against ordinary-sized enemies, choose the weapon for its baseline legendary greatsword performance and Strength interaction rather than assuming that the size-based advantage is active.
Because the weapon is a two-handed melee weapon, it does not provide the flexibility of a one-handed weapon used alongside a shield or another off-hand item. Its handling consequently favours a committed front-line role. Temporary hit points from Giant Form can help that role withstand retaliation, but they do not remove the need to manage positioning, enemy reactions, and the risks of remaining in close range.
Strengths, Weaknesses and Best Uses
Strengths
- Its passive doubles the damage bonus supplied by the wielder’s Strength modifier on a successful hit, giving Strength-focused characters a direct mechanical reason to prefer it over a greatsword with a less offensive passive.
- The sword grants advantage on attack rolls against Large, Huge, and Gargantuan enemies. That makes its accuracy particularly valuable in fights against giants, dragons, and other oversized targets, where landing important melee attacks matters.
- Giant Form increases the user’s size, grants temporary hit points, and adds extra damage to weapon attacks. Used at the right point in a difficult encounter, this combines offensive pressure with a temporary survivability buffer.
- Topple the Big Folk adds a weapon action to the wielder’s tactical options, rather than limiting the weapon to ordinary greatsword attacks.
- As a legendary +3 greatsword, it combines a high enchantment bonus with the Strength-scaling passive and several distinct combat effects.
Weaknesses
- It is a greatsword, so its benefits are tied to a two-handed melee role; it is not a flexible choice for a character who needs a shield, off-hand weapon, or one-handed setup.
- The doubled Strength bonus has little or no value for a character who is not making attacks with a meaningful Strength modifier. Finesse, spellcasting, and other non-Strength weapon plans therefore do not make equally direct use of its defining passive.
- Its enemy-size advantage is matchup-dependent. Against Medium or smaller enemies, the weapon remains a powerful legendary greatsword but does not receive that specific accuracy benefit.
- The sword is obtained in Act 3 after the Wyrmway sequence and the confrontation with Ansur, so it cannot support early- or mid-game progression and arrives after many build-defining choices have already been made.
- Giant Form and its other special actions do not remove the normal commitment of a greatsword user to close-range weapon combat; characters built around ranged attacks or spellcasting will not exploit the full package.
Best uses
- A Strength-based frontline character who spends most turns making weapon attacks and wants the passive’s doubled Strength contribution.
- Act 3 encounters featuring Large, Huge, or Gargantuan enemies, where the weapon’s built-in attack advantage directly improves its matchup.
- Boss fights or dangerous melee engagements where Giant Form’s temporary hit points and added weapon-attack damage can support a decisive burst window.
- A two-handed greatsword setup that wants a late-game legendary weapon with both a reliable enchantment bonus and situational control or transformation tools.
Compared With Similar Weapons
| Weapon | Class / role | Enchantment | Defining mechanics | Best fit |
|---|---|---|---|---|
| Balduran's Giantslayer | +3 | Doubles the wielder's Strength damage bonus on a hit; grants Giant Form, Topple the Big Folk, and advantage against Large, Huge, or Gargantuan enemies | Strength-based characters that want a high-impact melee weapon, especially against large enemies | — |
| Silver Sword of the Astral Plane | +3 | Adds psychic damage and provides substantial benefits to a Githyanki wielder, including defensive and saving-throw advantages | Githyanki characters or builds that value psychic damage and defensive benefits over Giantslayer's Strength scaling | — |
| Sword of Chaos | +2 | Restores hit points to its wielder when it deals damage | Front-line characters that value self-healing and sustained combat rather than Giantslayer's size-based advantages | — |
| Nyrulna | +3 | Returns after being thrown and creates an explosive effect on impact, making it useful at both melee and ranged distances | Throwing builds or characters that need reliable ranged weapon access instead of a dedicated greatsword | — |
Lore and Design
Balduran's Giantslayer is presented as a relic of Balduran, the legendary founder associated with Baldur's Gate. Its name and history give the weapon significance beyond its legendary rarity: it links a late-game reward to one of the setting's foundational figures rather than treating it as an unrelated magical greatsword.
The weapon's most important documented story connection is to Ansur, the dragon Balduran is said to have slain with it. In Baldur's Gate 3, that history is encountered during the Wyrmway and the Dragon's Sanctum sequence, where the sword is recovered after the confrontation with Ansur. This makes the weapon part of the game's exploration of Balduran's legacy and of the conflicting history surrounding his relationship with the dragon.
No official developer commentary or documented real-world design reference is established here. Its design significance is therefore best described through its in-game associations: the founder of Baldur's Gate, the dragon Ansur, and the Wyrmway trials that preserve the weapon's legend. The nearby Helm of Balduran reinforces the location's role as a repository of Balduran's legacy, but it is a separate legendary item rather than part of the sword itself.
Trivia
- Balduran's Giantslayer is tied to the legend of Balduran, the figure traditionally credited with founding Baldur's Gate. In the game's history, Balduran used the sword to kill the dragon Ansur, linking the weapon directly to the city's founding mythology and to the events surrounding Ansur's lair.