Booming Blade

Booming Blade is a cantrip (Evocation). It allows the caster to strike with their melee weapon, dealing further damage if the target moves afterwards.

Description

Strike with your weapon, afflicting your foe with a resonance that hurts them for 1d8⁠⁠Thunder when they move.

This spell can be cast while you are  Silenced.

Requires proficiency with the equipped weapon

Properties

Cost

 Action

Damage: 1~8

Normal weapon damage

+ 1d8⁠Thunder (When the target moves)

Details

 Melee weapon attack roll

 Range: Normal weapon range

 Recharge: Per action

At higher levels

At character level 5, the damage increases to

Damage: 3~24

Normal weapon damage

+ 1d8⁠Thunder

+ 2d8⁠Thunder (When the target moves)

At character level 11, the damage increases to

Damage: 5~40

Normal weapon damage

+ 2d8⁠Thunder

+ 3d8⁠Thunder (When the target moves)

Technical details

UID

Target_BoomingBlade_ClassSpell

Spell flags

IsDefaultWeaponAction, IsHarmful, IsMelee, IsSpell

Condition: Booming Blade

 Booming Blade

Duration: 1 turn

• Affected entity will take 1d8Thunder damage when it moves.

How to learn

Classes:

• Class level 1: Sorcerer, Wizard, and Warlock
• Class level 3: Arcane Trickster, and Eldritch Knight

Races:

• Character level 1: High Elf, and High Half-Elf

(Character level is the sum of all class levels for a multi-classed character.)

Granted by features:

•  Magic Initiate: Sorcerer
•  Magic Initiate: Warlock
•  Magic Initiate: Wizard

Other ways to learn:

• There are no scrolls available for wizards to scribe to their spellbooks.

Notes

• Since this cantrip uses a weapon attack roll, it qualifies for  Extra Attack. Whenever the caster could make a normal melee attack, this cantrip can be cast instead; although it is limited to one cast per action.
  • Receiving Extra Attack via the  Sentinel: Vengeance passive on a character who has already begun their turn will allow that character to attack once with Booming Blade, and then again by using an Action, circumventing the one cast per action restriction.
• Unlike every other cantrip in the game, Booming Blade receives its final upgrade at level 11, not level 10.
• Because its damage includes weapon's damage, this spell allows to trigger effects that care about spell damage type (e.g.  Poisoner's Robe,  Mourning Frost) with weapon damage.
• Booming Blade causes  Diadem of Arcane Synergy to grant  Arcane Synergy as it inflicts a condition.
• It also triggers the  Ring of Arcane Synergy by virtue of being a damage-dealing cantrip.

Bugs

• Though it is not displayed in its description, Booming Blade can be cast while  Silenced.
• This cantrip is not correctly classified as a ⁠Thunder spell so it does not work with the following effects:
  •  Bone-shaking Thunder
  •  Destructive Wrath
  •  Elemental Adept: Thunder
  •  Heart of the Storm: Thunder
  •  Necklace of Elemental Augmentation
  •  Ring of Absolute Force
  •  Prophecy: Thunderous Applause
• Some other elemental effects are implemented differently and work with the ⁠Thunder damage Booming Blade receives at level 5. These effects include:
  •  Boots of Elemental Momentum
  •  Gloves of Belligerent Skies
  •  Hat of Storm Scion's Power
  •  Ring of Elemental Infusion
    • Due to an additional bug, these items do not work in Honour mode unless the weapon itself deals elemental damage (e.g. from  Elemental Weapon or any innate elemental damage bonus).

External links

⁠Booming blade on the Forgotten Realms Wiki