Canon en Verre

A small glass shard is absorbed into your hand. Your hand starts glowing a deep color, based on what damage type you picked. 

All enemies inside the cone take an extra 2d6 elemental (Cold, Fire, Lightning, Thunder, or Poison) damage. Enemies who attack the caster, who are in the effects of the spell, get a +3 to hit. The target must succeed on an Intelligence saving throw or be affected by the spell for its duration.

At Higher Levels. When you cast this spell using a spell slot of 4th or higher, the damage increases by 1d6, +1 to hit, and the range increases by 5ft for each slot level above 3rd.