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I have created some new cantrips which include making a weapon attack as there are only two official ones to choose from. I've tried to follow these principles based on Booming Blade and Green-Flame Blade:

  • Melee weapon attack only, 5 foot range
  • No unavoidable extra damage to the primary target at level 1
  • Damage no more than 2 targets
  • Spellcasting ability modifier doesn't have to affect the spell at all
  • Only available on the Warlock, Sorcerer and Wizard spell lists

But with such a small amount of official content to compare them against, it's hard to say if they're balanced.

Is this spell balanced with Booming Blade and Green-Flame Blade?

Caustic Cleave

Conjuration cantrip

Casting Time: 1 action
Range: 5 feet
Components: V, M (a weapon)
Duration: Instantaneous

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 acid sprays from your weapon arc to a different creature of your choice that you can see within 5 feet of you. Make an attack roll against the second creature with the same attack bonus. On a hit, it takes 1d6 + your spellcasting ability modifier acid damage.

At 5th level, the melee attack deals an extra 1d6 acid damage to the target, and the acid damage to the second creature increases to 2d6 + your spellcasting ability modifier. Both damage rolls increase by 1d6 at 11th level and 17th level.

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  • \$\begingroup\$ I feel like all of these spells you are creating are a way to fill a perceived gap in available damage types for a specific type of spell. Older versions of dnd basically did that by having a feat or ability that allowed casters to change the damage type of the spells as they saw fit. Perhaps that will fit your needs better than creating a dozen new nearly identical cantrips. \$\endgroup\$ – Duck May 14 at 3:09
  • \$\begingroup\$ @Duck Actually I've written about that here, I'm not a fan. rpg.stackexchange.com/a/124979/36002 \$\endgroup\$ – Richard May 14 at 16:04
  • \$\begingroup\$ @Richard I was referring to something along the lines of [Elemental Spell][d20pfsrd.com/feats/metamagic-feats/elemental-spell-metamagic] Metamagic Feat from Pathfinder rather than a simple reskinning \$\endgroup\$ – Duck May 18 at 2:42
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Reasonably balanced

You've traded the auto fire damage that GFB provides for an additional attack roll for acid damage. FIre is commonly resisted, so I like the die level drop for acid and requirement to hit.

My only concern is the additional guaranteed acid damage at higher levels, but i'm not sure it's enough to change it or to have a different scale.

Consider making the acid damage 1d4 to help minimize.

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