Here is my first cut on wordsmithing your AoE metamagic thing ... Artillery spell
When you cast a spell that targets an area of effect that isn't yourself, you may spend 5 sorcery points to increase the spell's range, as long as you can see the target. Make a spellcasting ability check with the DC equal to your distance from the target and yourself divided by the spell's normal range (miniumm DC of 20). On a success, the spell targets the location. On a failure, the spell targets a location around the target determined by a d8 die roll: (1=North; 3 = East, 5 = South, etc.) and a d10 die r…