Prerequisite: You must know the Cantrip Firebolt
You can now cast certain AoE at a distance by launching them with the Firebolt Cantrip
When you cast a spell with a spherical or cubic AoE, area of effect (Excludes Cone) you can choose to use a spell slot of 1 higher level, and use your bonus action to cast Firebolt instead of the initial spell at your location. Your initial AoE spell is cast at the Firebolts destination.
Example: You can cast Thunderwave of 1st spell slot level where your firebolt lands, by spending a 2nd level slot and using your bonus action
The Firebolt does deal its damage as usual, then triggering the passenger AoE spell attached to it.
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