The D&D 5e bastard sword is a versatile two‑handed melee weapon that can be wielded one‑ or two‑handed, making it a popular choice for players seeking flexibility. As a martial weapon, it deals slashing damage and is defined by the two‑weapon fighting rules when used one‑handed. This guide explains how it works in practice, compares it to similar weapons, and clarifies common questions about its use, helping both players and DMs integrate it confidently into games.
Core Rules and Weapon Properties
In the Player’s Handbook, the bastard sword is a Martial, Two‑Handed, Simple weapon that deals 1d10 slashing damage. It is classified as versatile, meaning it can be used with one hand to deal 1d8 damage instead of 1d10. It has the following key traits:
- Category: Martial weapon
- Proficiency required: Simple weapons proficiency
- Properties: Versatile, two‑handed (when used with two hands)
- Damage die: 1d10 (two‑handed), 1d8 (one‑handed)
- Range: Melee, reach 5 feet
When you use it in one hand, you can apply the same damage die as long as you’re not holding another weapon, since it doesn’t grant an off‑hand bonus on its own.
Official Sources
| Attribute | Verified Detail | Source Type |
|---|---|---|
| Damage | 1d10 slashing (two‑handed), 1d8 slashing (one‑handed) | Player’s Handbook |
| Properties | Versatile, two‑handed | Player’s Handbook |
| Proficiency | Simple weapons proficiency required | Player’s Handbook |
Bastard Sword in Two‑Weapon Fighting
Because the weapon is versatile, many players consider using it in two‑weapon fighting. However, there is important clarification to make:
- When used one‑handed, it counts as a one‑handed melee weapon for off‑hand attacks.
- If you do not hold a shield or reach weapon in the off‑hand, your off‑hand attack does not add ability modifiers to damage unless you have features like fighting style (e.g., Two‑Weapon Fighting) or class features that grant that bonus.
- The Light Blade fighting style does not apply, as the bastard sword is not a light weapon.
- Two‑Weapon Fighting fighting style lets you add your ability modifier to the damage of the off‑hand attack when you take the Attack action and attack with two melee weapons.
Important Rules Distinction
The term two‑handed in the weapon description means you can choose to use two hands to gain the 1d10 damage die. When you choose to use it one‑handed, you can still use a light off‑hand weapon for two‑weapon fighting, or you can use a shield or reach weapon. The key is the choice you make at the start of your turn, not an absolute requirement.
Comparisons to Similar Weapons
Comparing the bastard sword to other martial melee weapons clarifies its niche. Consider the longsword and greatsword for context.
- Longsword: 1d8 slashing, versatile. Can be used one‑ or two‑handed with a consistent damage die (1d8). More consistent damage, slightly less burst.
- Greatsword: 2d6 slashing, two‑handed only. Higher average damage, but you cannot use it one‑handed.
- Bastard Sword: 1d10 slashing, versatile. Offers a middle ground with the option for higher damage when two‑handed, flexibility to switch, and compatibility with some ranged builds where you need a hand free for a shield or crossbow.
| Weapon | Damage | Properties | Category |
|---|---|---|---|
| Longsword | 1d8 slashing | Versatile, finesse, reach (special), two‑handed (special) | Martial |
| Bastard Sword | 1d10 slashing (two‑handed), 1d8 slashing (one‑handed) | Versatile, two‑handed | Martial |
| Greatsword | 2d6 slashing | Heavy, two‑handed | Martial |
Practical Use and Builds
Tactically, the bastard sword shines when a player wants a reliable slashing weapon that can switch between two‑handed power and one‑handed flexibility. Common archetype fits include:
- Champion fighter prioritizing powerful single attacks, using two‑handed for consistent 1d10 damage.
- Eldritch Knight fighter using it in one hand while holding a shield, sling, or light crossbow in the off‑hand for ranged support.
- Some hexblade warlocks use it as a versatile melee option, especially when warding off attacks with a shield.
If you want consistent damage without the two‑handed requirement, the longsword may be simpler. If you want maximum burst and don’t need a free hand, the greatsword is stronger. The bastard sword is best when you specifically need the option to switch between one‑ and two‑handed use in the same turn or when you want a martial weapon with reach options.
Frequently Asked Questions
- Can I use the Two‑Weapon Fighting fighting style with a bastard sword in one hand? Yes, provided you also attack with a light melee weapon in your off‑hand, you can add your modifier to the off‑hand attack damage.
- Can I use a shield with the bastard sword? Yes, you can use a shield when wielding it one‑handed. If you use two hands, you do not have a free hand for a shield.
- Does it work with reach weapons? If you take the Attack action while holding a reach weapon in one hand and the bastard sword in the other (one‑handed), your reach with the bastard sword does not increase; it remains 5 feet.
- Is it better than a greatsword? Not inherently; it trades raw damage potential for flexibility. Choose based on whether you need the option to switch to one‑handed use.
Tips for Players and DMs
- Always declare whether you are using the bastard sword two‑ or one‑handed at the start of your turn.
- When building a melee character, consider action economy and whether you value consistent damage (longsword), burst (greatsword), or flexibility (bastard sword).
- DMs can use the weapon in NPC builds to reflect a character who values readiness for different combat roles.
Bottom Line
The D&D 5e bastard sword remains a niche but useful martial weapon for players who want flexibility between one‑handed and two‑handed use. It is not the highest damage option in most cases, but its versatility and compatibility with shields or crossbows give it a clear role in certain builds. Understanding its rules, distinguishing it from similar weapons, and applying best practices for use will help you integrate it effectively at the table.