Casting Time: 1 action
Range: 5 ft
Components: V, M
Duration: Instantaneous
Damage Type: Fire
As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell's range, otherwise the spell fails. On a hit, the target suffers the attack's normal effects, and green fire leaps from the target to a different creature of your choice that you can see within 5 feet of it. The second creature takes fire damage equal to your spellcasting ability modifier.
This spell's damage increases when you reach higher levels. At 5th level, the melee attack deals an extra 1d8 fire damage to the target, and the fire damage to the second creature increases to 1d8 +your spellcasting ability modifier. Both damage rolls increase by 1d8 at 11th level and 17th level.
Material Component:
a weapon
Verbal Component:
Imbuo Arma Cuum Ignes Viridi
Classes: Sorcerer, Warlock, Wizard, Rogue, Artificer
Domain: Fire
Tags: Combat, Damage
Source: Sword Coast Adventurer's Guide
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Spell FAQs
Below are commonly asked questions about this spell. Some of the information is pulled official D&D sources (such as books and the twitter feeds of D&D officials), but other information is derived from forums and online discussions. As always, it is up to the DM to decide how they wish to spell questions. If you have a FAQ about this spell that you feel other DM's may wish to know, please send us the message!
Can you use green-flame blade with Extra Attack, opportunity attacks, and other weapon attack options?
Green-Flame Blade does NOT work with Extra Attack or any other feature that requires the Attack action. Like other spells, this cantrip requires the Cast a Spell action, not the Attack action, and it can't be used to make an opportunity attack, unless a special feature allows you to do so. [source: Sage Advice Compendium]
Can you use green-flame blade with a rogue's Sneak Attack
The
Green-Flame Blade weapon attack works with Sneak Attack if it fulfills the normal requirements for that feature. For example, if you have the Sneak Attack feature and cast
Green-Flame Blade with a finesse weapon, you can deal Sneak Attack damage to the target of the weapon attack if you have advantage on the attack roll and hit. [source: Sage Advice Compendium]
Other Planes and Effects
Below is information about this spell as it relates to other planes and area of effects (i.e. underwater). Some of the information is pulled official D&D sources (such as books and the twitter feeds of D&D officials), but other information is derived from forums and online discussions. As always, it is up to the DM to decide how they wish to handle spell effects.
Underwater - Verbal Component
Official rules have been verified by Jeremy Crawford - "No rule prohibits verbal components from working underwater. Keep in mind that if you're talking, you're not holding your breath." Hence, while submerged underwater and holding its breath, a creature can cast a spell that requires a verbal component. After casting the spell, if the creature can't breathe underwater, it immediately runs out of breath. The creature can survive for a number of rounds equal to its Constitution modifier (minimum of 1 round).
Underwater - Fire Effects
The PHB p198 clearly states "Creatures and objects that are fully immersed in water have resistance to fire damage." Other than that, there are no official rules regarding fire spells underwater. But, as always, it is always up to the DM to decide if fire spells should have different effects (i.e. half range, half area of effects, half duration, etc.). In addition, Jeremy Crawford has clearly stated, regarding a fireball vaporizing water, "Nothing in the rules causes a fireball to vaporize water. Magic ≠ physics. DMs may apply whatever magical/scientific logic they like."
